Thanks for the opinions everyone
I myself find some films a bit boring but movies such as Godfather Part 1&3 are just to amazing. And they are like 3 hours each. Also Once Upon A Time in America is like 4 hours long. I still haven't seen it, but I think I will like it. Some of you are wondering why I haven't mentioned Godfather Part 2.... Well I didn't like it that much. But this is only my opinion. But every scene involving De Niro was a classic. He did deserve that Oscar. I think his scenes is what kept the movie together. Also there are some good scenes with Pacino, but most of the scenes with Pacino are boring. I do not hate the film, but I wish it were a bit shorter.
Some people watch a movie once and they do not like it. But by the time they watch the movie again they love it. I have only seen the Godfather Part 2 once. But when I watched Part 1&3, I loved it on my first viewing. I generally like to think that the first viewing is the "real opinion" of the viewer. I think some people want to like a film so much, they watch it constantly over and over and think they like it.
But this doesn't work for all films. Especially for Mr. Scorsese's films. His films require two viewing in order to understand the full potential of the film.