I really tried to understand why this was considered a "great" movie, and watched a documentary on the making of CK. May have been on the DVD. All I remember was the comments on the camera angles, where front to back the entire set was in focus.
They mentioned others, but they escape me, and I won't waste the time to check them out.
What elements of greatness is it missing? The acting is terrific. It’s an intriguing character study with a quip filled script and it’s told in a way that could only be done in a film (as opposed to a book or a play).