It wasn't the balance of the fight that irritated me, it was the fact that they had Tony powered up by lightning.
The blast literally tore holes in his armor, but we're supposed to believe that it not only *didnt* fry all his circuits, but supercharged them?
I'd have much rather seen Tony use his brains to out-think Thor and stay in the fight with cunning (and still be on the losing end and Thor still be holding back) than just get a cheap power-up that made no sense.
I mean, this is a nitpick, I enjoy the movie a lot and this minor thing doesnt ruin anything for me, but I still think it was dumb.