Saw it last night, man that was awesome.
is my full review (both a non-spoiler and a spoiler one).
Iron Man 3 is a seamless mesh of humour, action and drama which deepens Tony Stark’s character whilst providing a lot of laughs and explosions along the way.
That's a basic summation of my feelings. I was very impressed. There were a few things I didn't see coming at all and I thought the climactic battle was superb.
One weird thing about the showing I went to - it was midnight and it was pretty busy, but presumably if you go to a midnight showing of a film you're a pretty big fan so you'd be aware that at the end of Marvel films there's a scene after the credits. Yet so many people left right as the film ended