Generally, I've seen most movie-rating websites, critics and fans rate the trilogy: The Dark Knight > The Dark Knight Rises > Batman Begins. Now I agree that Begins is the weakest, but such sites such as IMDb, Rotten Tomatoes, IGN have the last two higher than Begins. Why?
I'm not saying everyone says that, but from what I've come across, it comes across that way honestly speaking. However people really underrate Batman Begins, it was still a great film and way better than the likes of Iron Man IMO, heck I even think it was better than Avengers.