The 50 best game expansions of all time according to bgg users votes
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There is a geeklist here in bgg where the users vote in polls to classify how much the expansions improve or harm their base games (Expansions: their value decided by user's votes). All bgg users are free to go there and add new expansions and/or give votes to the ones that are already there.

In that geeklist the expansions are classified as excellent, nice, indifferent or harmful.

An excellent expansion was defined there as one that adds great value to the base game and is almost essential/highly recommended

That geeklist was created about one year ago. After that time it contains more than 500 expansions and many people went there to vote. I collected my data from that list to create this one. My criteria was:

1) to be here the game should be in that list and have more than 30 votes there
2) The main sorting criteria was the percent of users that voted the expansions as excellent in that other list
3) In case of tie, I picked the one who had more votes.

With this in mind I selected the 30 50 top expansions and listed them here.

If you don't agree with my criteria, the data are there and you are free to create your own list. If you don't agree with the opinion about the expansions, feel free to go there and submit your votes. In fact this geeklist is a way to make the other list better known. The more the people go there to vote the more useful it becomes.

Please keep in mind that the value of the basegame itself is not in question here, the important thing is how much the expansion improves the base game.

Edit: as this geeklist created some interest and as some comments mentioned other expansions that were not in the initial list of 30 expansions, I expanded the list to include 50 expansions. This way some of the expantions mentioned in the comments appeared, though clearly behind the initial 30 ones.
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1. Board Game: Twilight Imperium (Third Edition): Shattered Empire [Average Rating:8.63 Unranked] [Average Rating:8.63 Unranked]
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92.5% of the 93 voters considered this expansion excellent
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2. Board Game: Ticket to Ride: USA 1910 [Average Rating:8.01 Unranked] [Average Rating:8.01 Unranked]
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89.5% of the 315 voters considered this expansion excellent
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3. Board Game: Tuscany Essential Edition [Average Rating:8.69 Unranked] [Average Rating:8.69 Unranked] [Average Rating:8.69 Unranked]
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86.1% of the 223 voters considered this expansion excellent
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4. Board Game: Commands & Colors: Ancients Expansions #2 and #3 – Rome vs the Barbarians; The Roman Civil Wars [Average Rating:8.29 Unranked] [Average Rating:8.29 Unranked] [Average Rating:8.29 Unranked]
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84.4% of the 45 voters considered this expansion excellent
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5. Board Game: Kingsburg: To Forge a Realm [Average Rating:7.90 Unranked] [Average Rating:7.90 Unranked]
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84.2% of the 272 voters considered this expansion excellent
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6. Board Game: Mage Knight Board Game: The Lost Legion Expansion [Average Rating:8.84 Unranked] [Average Rating:8.84 Unranked]
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83.1% of the 183 voters considered this expansion excellent
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7. Board Game: Advanced Civilization [Average Rating:8.02 Unranked] [Average Rating:8.02 Unranked] [Average Rating:8.02 Unranked]
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81.8% of the 121 voters considered this expansion excellent
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8. Board Game: Eldritch Horror: Forsaken Lore [Average Rating:8.33 Unranked] [Average Rating:8.33 Unranked]
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80.1% of the 171 voters considered this expansion excellent
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9. Board Game: StarCraft: The Board Game – Brood War Expansion [Average Rating:8.23 Unranked] [Average Rating:8.23 Unranked]
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80% of 30 voters considered this expansion excellent
 
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10. Board Game: Castle Panic: The Wizard's Tower [Average Rating:7.50 Unranked] [Average Rating:7.50 Unranked]
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79.6% of the 108 voters considered this expansion excellent
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11. Board Game: Cosmic Encounter: Cosmic Incursion [Average Rating:8.24 Unranked] [Average Rating:8.24 Unranked]
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79.6% of the 103 voters considered this expansion excellent
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12. Board Game: Orléans: Trade & Intrigue [Average Rating:8.50 Unranked] [Average Rating:8.50 Unranked]
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78.3% of the 60 voters considered this expansion excellent
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13. Board Game: Rune Age: Oath and Anvil [Average Rating:7.73 Unranked] [Average Rating:7.73 Unranked]
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76% of the 50 voters considered this expansion excellent
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14. Board Game: Trickerion: Dahlgaard's Gifts [Average Rating:8.20 Unranked] [Average Rating:8.20 Unranked]
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75% of the 36 voters considered this expansion excellent
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15. Board Game: Race for the Galaxy: The Gathering Storm [Average Rating:8.08 Unranked] [Average Rating:8.08 Unranked]
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74.5% of the 322 voters considered this expansion excellent
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16. Board Game: Evolution: Climate [Average Rating:7.85 Overall Rank:236]
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74.5% of the 108 voters considered this expansion excellent
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17. Board Game: Stockpile: Continuing Corruption [Average Rating:8.05 Unranked] [Average Rating:8.05 Unranked]
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74.5% of the 47 voters considered this expansion excellent
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18. Board Game: Core Worlds: Galactic Orders [Average Rating:7.98 Unranked] [Average Rating:7.98 Unranked]
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74.2% of the 66 voters considered this expansion excellent
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19. Board Game: Oh My Goods!: Longsdale in Revolt [Average Rating:7.69 Unranked] [Average Rating:7.69 Unranked]
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73.9% of the 46 voters considered this expansion excellent
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20. Board Game: Commands & Colors: Ancients Expansion Pack #1 – Greece & Eastern Kingdoms [Average Rating:8.25 Unranked] [Average Rating:8.25 Unranked]
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73.7% of the 57 voters considered this expansion excellent
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21. Board Game: Lord of the Rings: Friends & Foes [Average Rating:7.27 Unranked] [Average Rating:7.27 Unranked]
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73.5% of the 49 voters considered this expansion excellent
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22. Board Game: Lords of Waterdeep: Scoundrels of Skullport [Average Rating:8.23 Unranked] [Average Rating:8.23 Unranked]
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73.4% of the 436 voters considered this expansion excellent
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23. Board Game: Space Alert: The New Frontier [Average Rating:8.52 Unranked] [Average Rating:8.52 Unranked]
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73% of the 63 voters considered this expansion excellent
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24. Board Game: Ticket to Ride Map Collection: Volume 5 – United Kingdom & Pennsylvania [Average Rating:8.07 Unranked] [Average Rating:8.07 Unranked]
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72.52% of the 131 voters considered this expansion excellent
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25. Board Game: Dominion: Prosperity [Average Rating:8.29 Unranked] [Average Rating:8.29 Unranked]
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72.5% of the 400 voters considered this expansion excellent
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