I've been watching anime for about 6 or 7 years now. Until recently, I haven't been much of a critic. Enjoyment is a major factor for me when I rate an anime. As you can tell from my list, it's really hard for me to give out anything under an 8. (I've only done so with 2 anime.) I believe that a lot (and I mean A LOT) has to be wrong with an anime in order for it to have a rating of 1.
Overall, I tend to enjoy most anime that I watch. My favorite genres are psychological, mystery, and action.