I like Shawshank, but you're right, it's probably overrated.
I loved Paths of Glory but not too many other Kubrick movies.
Loved Hard Eight and Boogie Nights, liked all the others, but sometimes wonder if Anderson is too clever by half.
Another one I saw recently: Notorious, by Hitchcock. Maybe it's dated and worked better back then. I've read reviews talking about the masterful camerawork and editing and whatnot. Okay, but I just didn't believe the story for one second.