Going to be as vague as posiible here...but I am going to discuss a few things that some might consider CONCEPTUAL SPOILERS
You have been warned
Saw it this afternoon. Look, they make a decision in the middle of the movie. It's a neat trick and very funny/clever. BUT, it derails the credibility of the threat. That being said, was it worth it? Yeah, probably. We will be able to discuss more when the spoiler ban lifts in about a week(that seems fair, no?).
My major complaint...it's Dark Knight disease. An Iron Man movie that's not got much Iron Man in it(feel free to say that in a Monty Python SPAM voice...I did). Sure, lots of sequences with empty suits. And that's pretty appropriate because this movie is one...big...empty...suit. Part detective movie, part kid-buddy movie and a lot of busybusy without anything really happening. Sure, it was enjoyable enough, RDJ can do this in his sleep and he kinda sorta did. For the life of me I cannot understand Shane Black's X-mas fascination. It felt really odd to be watching a holiday movie in May. End of the day, a few fun moments wrapped in some headshaking plot holes(that you really just forgive at some point...like Doc says, you don't expect these movies to make sense anymore). Completely forgettable and disposable. Neither good enough to praise or bad enough to tear apart.
And the 3d was neither great or horrible. If you like the overall depth that a post conversion provides it's fine.