If I consider number of times seen, either Forrest Gump or Unforgiven.
Taking the other winners which I also gave a 10 on IMDB I can complete a Top 10: Schindler's List, One Flew Over the Cuckoo's Nest, Braveheart, Gladiator, Amadeus, Rain Man, Ben-Hur and both Godfathers combined.
The Departed is the only one I disliked out of the 40 I've seen. (and I find it awful that my favorite movie didn't win because the Weinstein's lobby was strong enough to boost Shakespeare in Love...)
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ALL HAIL! King of the losers!