Slightly better than Ishtar...
Not by much. It's just blessedly shorter, resulting in less bleeding from the eyes.
The Deer Hunter would certainly have been in my personal top 10, as it combines a compelling story, unforgettable imagery, shatteringly dramatic tension, and the entire gamut of human emotions.
The Great Escape, starring Steve McQueen, was also a terrific war movie.
It is regrettable that Hollywood never seems to honor Westerns, nor makes them much anymore, because there are any number of classics worth mentioning:
High Noon,
Once Upon a Time in the West, and
High Plains Drifter among them, all of them morality plays in a world - ours and theirs -where morality might be notably absent, but still matters in the end.
Likewise, Hollywood doesn't often dispense justice to films of the comedic genre, but the Marx Brothers'
Duck Soup and Mel Brooks'
Young Frankenstein contain moments of absolute hilarity and creative genius.