What are some alternatives?
When comparing IMDb and Rotten Tomatoes, you can also consider the following products
Simkl - Simkl is a TV, anime, and movie tracker that keeps a history of all the shows and movies you watch in one, central location. It’s a mobile app, a website, Google Chrome extension to keep track of everything you watch and integrates with many TV apps
Metacritic - Metacritic aggregates music, game, tv, and movie reviews from the leading critics. Only Metacritic.com uses METASCORES, which let you know at a glance how each item was reviewed.
Letterboxd - Letterboxd is a social site for sharing your taste in film, now in public beta.
Trakt.tv - Automatically track TV shows & movies you're watching.
themoviedb.org - free movie database
Criticker - The TCI is a measure of the similarity between two people's taste in films.