I've been an active member of the geek for 7 years now, and I have enjoyed every minute of it. The geek has helped me get into games I would otherwise never have heard about, and my gaming tastes have evolved a lot because of that. I am now fairly certain about what I want in my games:
1) I want some randomness. I enjoy dice and random card draws, but it can also be as simple as a random setup or tiles appearing in random order. Games with no randomness, where all variation is totally dependent on the players is something I do not enjoy.
2) I do not like games that are too unforgiving. This ties in with nr. 1, as randomness often has the effect of evening out the odds a bit and making the games more forgiving. Games where it is possible to calculate every move and optimize everything are often unforgiving, and I don't like those so much because of that.
3) I like strong themes and pretty components in my games. It doesn't have to be RPG-like, a good euro which as least has made an effort at following a certain theme is good enough for me. Stone Age is an example of this.
4) While I really enjoy longer games, I often do not have the time for them, and often become a bit frustrated when games drag. 4 hours is usually fine, but more than that is rarely ok. Experience games, like Runebound, I can play for longer.
5) When buying games I have to think about who to play them with, and this means I have some preferences. I play a huge amount of two player games with my wife, so good two player games are always of interest. My friends are also gamers, and anything from ameritrash to euros usually goes. However, we often end up being 5 players, so games that accomodate 3-4 players are often the worst for me. My wonderful kids (5, 9 and 13) have also become more and more interested in gaming, so family games are something I look for.
6) Mechanisms I enjoy a lot are engine building, resource management, and some kind of dice rolling. I also have a weak spot for miniatures and dungeon crawls. Interaction is important, I want to feel that what I do has an impact on the other players. I used to not like auctions but am now more open to having auctions in games. Just as long as they tie in with the theme in some way.
You are more than welcome to check my geeklist on me and my wife's experiences with two player games:http://www.boardgamegeek.com/geeklist/30945/page/1
It is now not updated anymore, and I keep thinking I should do a new one at some time.
My top 10 is my all time top 10. I have stopped updating my hot 10 since it changes so often. Check my wishlist to see what games I am most interested in buying.
And please, feel free to geekmail me on any subject, I love to get mail!