Rotten Tomatoes

Rotten Tomatoes compiles all the critical reviews of a movie, then creates a composite score based on if the reviewed liked or hated the movie. The site navigation is a bit cluttered, but not so bad that it hurts the site. The way that the reviews are laid out on each movie page is very nice, and it's fun to check out the composite score that really bad movies get. I think some are actually at o%.