If you’re wondering whether Roger Ebert’s tepid review of Lord Of The Rings is typical (it’s not), or if everybody agrees that The Majestic is irredeemably sappy (they do), there’s two sites that give easy access to movie reviews.
The Internet Movie Database is enormous, a mind-boggling reference library on film. Click on the “External Reviews” link to see reviews of a movie in all the major newspapers, plus dozens of other sources you’ve never heard of before.
RottenTomatoes.com quotes a sentence or two from a vast array of reviews and links to the text of the full review in most cases.