Here's the rating scale I use, and how it corresponds to BGG ratings:

- Enthusiastic: I love the game and want to play it. (9, 10)
- Suggest: Good game, I want to play it and will usually suggest it. (7, 8)
- Indifferent: I'll play the game, if necessary, but won't suggest it. (5, 6)
- Avoid: I don't want to play this game. (1-4)

(Thanks to Brian Bankler)