I use the 'alternate rating system' proposed a while back in the BGG forums:
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.
My 'Hot 10' are games currently getting some table time.