I'm just going to come right out and say it - The Godfather. I watched this again the other day (My 3rd watching, I think), and I just don't understand the following this movie has. The acting isn't really that special, the story isn't all that compelling, and the cinematography is certainly nothing to write home about. The only thing I can think of that lends to it's success and following is the fact that maybe it came out when there really weren't a lot of other "mob" movies? However, now we have films like Casino and Goodfellas that do a far better job, IMHO.
What movies do you find overrated?