I enjoyed it. Sure, it was a dumb action flick, but Robert Downy Jr. puts on a humorous performance without getting Cpt. jack Sparrow silly. It may not be as good as the first, but it's close. Definitely better than the second.
Saw it today - had a great time watching it. Much more enjoyable than Oblivion. Would have liked to see more details in the final action scene and the bad guys in that last scene were just a touch too over the top.