But there are many excellent movies, and taste is individual. The lists seem to be a bit "cinephile".
If I think about my instant personal favorites then some of them are (just by heart and not in order) : Leon (I love Leon), Scent of a woman (Pacino is an incredible actor), The big Lebowsky (everybody likes the dude), Slum dog millionaire (great music, great discovery), Crash, Taken, or for example La vita è bella (Benigni).. But so many good films and indeed The Godfather, or Once upon a time in america,..
Interesting thread. High quality