I use websites for news, but not reviews. These days it's so easy to get word of mouth opinions from communities or social networks you're involved with that review sites are less useful (to me at least).
Rottentomatoes and metacritic. I don't find the specifics of a review useful. An aggregate of general opinions may give me some indication of value - if it is running under 10% on the tomatometer, or over 90%, I am generally guaranteed the film will be respectively bad or good. If it is running in the middle, my own preferences will tend to trump the general issues that determine the average, so I can flip a coin.