"Metacritic compiles reviews from respected critics and publications for film, video/dvd, music and games. Our unique Metascores show the critical consensus at a glance by taking a weighted average of critic grades."
Sound complex, but the site pulls it off very well. Simple interface, intuitive color coding (unless you're colorblind), and about as accurate as you can get when dealing with such a subjective subject. Sadly Zoolander only scored a 60, but most of America is too dumb to pick up the brilliant/subtle humor of the film...
http://www.metacritic.com