Found these game ratings from Friendless here on the Geek and decided to use them for my own ratings:
10: Outstanding game. One of my all-time personal favorites.
9: Excellent game. Always a pleasure to play. Shines under most circumstances.
8: Very good game. Rarely disappoints me. High on my request/recommend list.
7: Good game. Usually willing to play. I might even request or recommend it.
6: OK game. Some fun or challenge at least. Enjoyable in the right circumstances.
5: Average game. I'm indifferent, but may be willing to play.
4: Below average game. I avoid playing and would need to be persuaded.
3: Poor game. Will strongly resist playing.
2: Very poor game. I refuse to play this.
1: Dead game. Seriously negative entertainment value. Black Hole of Fun.