Same here. I really liked it, but the first one had the added bonus of exceeding my expectations, because so many of the super hero movies I have seen were pretty mediocre. Iron Man 2 what pretty great, but i was expecting it to be awesome, so it wasn't really a surprise.
I was a bit disappointed about the last fight with whiplash being pretty short, but after talking to est about it he gave me a different perspective and it makes a bit more sense. He saw it that they needed both Iron Man and War Machine to defeat the bad guy, so it was supposed to be more about setting up that War Machine will be sticking around in the next movie. Also, with all the drones being dealt with just before that I was getting a bit bored of all that, so while I would have liked to see more of Whiplash and his whips, Iron Man and War Machine fighting bad guys over and over and over was getting a little stale.