Re: Favorite villain of the trilogy?
Stane hands down. Bridges was great in the role and I thought they did the best job of building him up as the main threat.
I liked Vanko/Whiplash, but he was way too underdeveloped. I liked Hammer too, while I think he could've been portrayed a bit more seriously. Though I do think that Favreau hinted at him having a darker side at least.
I don't consider Trevor to be a villain and Killian was just bland. Weak motivation and just a poor representation of the Mandarin.