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Out of those 10, it’s One Flew Over the Cuckoo’s Nest for me.
But though there are some decent films on that list, it’s so relentlessly American (e.g. Tom Jones, Lawrence of Arabia, The Artist all won). What’s more, I think it shows the historical lack of judgment of the awarding committees that many American greats were either not nominated (e.g. Blade Runner) or lost out to inferior films (e.g. Citizen Kane).
And, of course, many of the greatest films that might have won are not American at all (400 Blows, Mouchette, Stalker, Alice in the Cities, Wild Strawberries, etc, etc).