As far as online review aggregators for film goes, Rotten Tomatoes is perhaps the most revered, and has been for the last 20 years. "The much dreaded Tomatometer, though not indicative of a film's quality as is iMDB's rating system per se, but rather, the percentage of critics, professional ones at that, who enjoyed that particular film. The innate problem with this system is the differing tastes of critics.
More often than not, a polarizing film considered by many to be a masterpiece, would have an unfavorable Tomatometer score due to the fact that more mainstream, blockbuster-geared critics seen it as compared to those more attuned to the arthouse. Additionally, a bad Tomatometer score would not only psychologically affect a critic's rating, often causing an even greater drop in score than the film rightfully deserves, but due to the site's popularity and reputation, might even deter audiences from watching the film to begin with."
