I've said previously and I'll say it again (and this time I know I have another FT'er on my side) that the best movie ever made was in fact "The Third Man" directed by Carol Reed, based on a script written by Graham Greene.
First off, I don't think we want to get into a debate about Margaret Mitchell vs. Graham Greene. We all know who the better writer was. Carol Reed was possibly the best English director ever in the history of cinema. Who directed "GWTW" again?
GWTW is a big epic picture, with a lot of money thrown at it, to be sure. But I have never been in awe of "GWTW" and I never shall be, especially since it smacks of a apologia for wealthy white southerns in the middle of Civil War.
"The Third Man" contains Orson Welles' finest performance aside from Citizen Kane (a movie I still hold to be overrated, though it is definitely the best movie ever produced and directed by a 25 year old). It also contains Joseph Cotten's finest performance. It is a beautifully written script (Graham Greene will do that for you). The musical score is haunting and entrancing, and the cinematography is one hand brilliant and yet disturbing.
And, it doesn't give you any easy answers, or catch lines. You watch "The Third Man" and you are left with several uneasy questions, about ethics, about society and about the general state of the human condition. It may the first movie to accurately portray a sociopath (thanks in part to Welles' incredible performance). It's movie that few people have seen, but it's a movie that I have seen in every Video Rental Store I've been in.
Do yourself a favor and rent it, and watch it, before you praise some big hunk of Hollywood pap as the greatest movie ever.