Re: Disappointments of the Trilogy?
IM - Iron Monger (and his cheesy lines)
IM2 - Whiplash (and his terrible mk. 2 armor and anticlimactic death)
IM3 - The Mandarin (and all that he could have been)
I would have liked to see:
More War Machine. Less Iron Patriot.
More alcohol. More unibeams.