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Go see it. The action was not to long and drawn out and it was funny to. there were so many more action scenes like the air force one attack, the Chinese theatre and the fight in the small town to name a few.
Even though their is a serious tone to Iron Man 3 their is still comedy through out, two memorable lines were Tony saying to Harley (the 10 year old), "Fathers leave, don't be a pussy." Also the kitchen scene in Tennessee where the extremis patient asks "Is that all you got a cheap trick and a cheesy one liner," and he replies " sweet heart that could be the name of my autobiography."