Terrific flick! Some have complained about the dialog, saying there's too much wisecracking. I, for one, loved it. It was a breath of fresh air to hear clever, rapid fire dialog, delivered expertly and in just the right tone, cynical, without being melancholy.
In this respect it reminded me of Howard Hawks' classic 'The Thing from Another World', also known for it's rapid, overlapping dialog. Great stuff.
I think it's difficult for modern (and young) audiences to realize that most people used to converse this way, without using the F word or other profanities every other word. This was made at a time when innuendo and wit were as prevalent as the F word is today. A different time. A different world.