I rate my anime the way I rate anything else be it music, movies, books, or anything else. If I like it its good. I know some friends of mine that watch anime for the sake of watching it and take anyhting that japan has to give, be it good or bad. (I even caught him watching DBZ of all things.) But there are animes that I wont watch because they are utter crap.
*builds rocket and flies away from planet at speed of light*
I even come down on good animes because of the way they let the symbolism take front seat to the story and characters. Take evangelion for instance, if you cant have a good show without a good story, and you can't have a good story without good characters then evangelion was utter crap, I sat there for 30 episodes watching shinji get his nuts kicked by his dad, asuka, rie, and the rest of the cast only to see him throw away human kind in not one but TWO crappy endings. Not to mention that the good guys were the bad guys and the bad guys good guys the scientific inacuracies and that bitch Asuka (she needs to be mentioned twice.) After about 5 episodes the only thing that kept me going was the hope that things turned out right for shinji and was sorely disapointed. This would be my main example. but don't star flaming me yet I havent gotten to why I hate gundam wing or the ending to CB yet.
*travels to ice planet to wait out flammings*