In recent years I have relied on JustWatch to quickly see ratings and where to watch a movie. I used to use MovieLens (run from a university) and tried it again and found it is a much better predictor of movies I will like.
| Key Requirement | MovieLens.org | JustWatch | Metacritic | IMDB |
| Personalized movie ratings | Excellent | No | No | No |
| Ratings by others | users of MovieLens | Yes | users of Metacritic | users of IMDB |
| Where to Stream | No | Yes | Yes and theaters | |
| Information | Movies – TMDb | Movies, TV | Movies+TV+Games etc. | IMDB |
| Share lists | Yes | Yes | ? | ? |
| UI | Web, WebApp | App, TV app, Web | Web, Android | App, Web |
| Ad heavy | No ads | Yes | Yes | Yes |
| When to use | Find movies I would like – Generates personalized predictions for movies you haven’t seen. Amazing | For finding streaming sources works on Apple TV | Average critics and decent finding where to watch | Want detailed movie meta information |