I like how they at least follow their own logic in Iron Man 3! The best part for me was where the suits become fireworks :) This movie seemed built for 3D (At least when completely submersed in the screen).
This movie made me feel like even I could become an influential person in the world with how I handle situations. DON'T expect this to follow completely to the story line of the previous 2 movies.
In the end I would recommend seeing this one at least once (even in dollar theatres).