First time I’ve heard about this, Metacritic is a web site that;
…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.
Lately I’ve been trying to keep “radio silence” on reviews so has not to go into a movie with preconceptions of what I’ll find so I’m not sure how much I’ll use it. Sounds good though, great idea.