I'm an avid moviegoer (50+ theatrical releases a year) and I completely ignore movie reviews (and it's getting this way with Yelp reviews too) because they lack context. What I mean by this is that a thumbs up/down or star rating is useless unless I have some background on the person giving the rating. For example, for someone to give Prometheus 2 stars when they haven't seen any of the Alien movies is different from an avid fan. I'd like to see a list of other movies/genres the reviewer rated, and maybe some basic demographic info before I listen to their opinion. Not sure if you have that worked into your idea yet...
Apropos of nothing, but a few times in my life I've actually gone to the theater to see a movie I knew nothing about. Nothing about the plot, the cast, etc. No trailer. It's a distinct experience, and sometimes highly pleasant. (I say "Heat" this way. Which was cool because the whole beginning of the movie is that long sequence with DeNiro stealing the ambulance, but I had no idea what the movie was, not even genre, and it was fun to try to figure out what was going on :)
Context is definitely missing from most systems and it's one of our key differentiators. Our goal is to handle all those contextual details so you don't have to.