What are some alternatives?
When comparing Simkl and Metacritic, you can also consider the following products
IMDb - Internet Movie Database
Letterboxd - Letterboxd is a social site for sharing your taste in film, now in public beta.
Rotten Tomatoes - Rotten Tomatoes, home of the Tomatometer, is the most trusted measurement of quality for Movies & TV. The definitive site for Reviews, Trailers, Showtimes, and Tickets
Trakt.tv - Automatically track TV shows & movies you're watching.
Filmsomniac - Filmsomniac.com | TV Tracker | Movie Tracker
Criticker - The TCI is a measure of the similarity between two people's taste in films.