Professor Stevens does a great service to the psych department at UCLA in my mind. He does a great deal to assure cognitive science's place as legitimate and worthwhile academic pursuit (at least in my mind), while remaining critical and recognizing the weaknesses therein. I enjoyed his class very much, and would certainly recommend him. I wouldn't worry about the grade if yor are a serious student; I doubt anyone was suprised by the grade they got, whether high or low.