Ever since the X-Men series landed Michael Fassbender and James McAvoy, they've been the best, hands down. They were already debatably the best, but they were set back by some bad movies. (Wolverine Origins, X-Men 3)
Second up is the Avengers. Probably won't be as good in the second one because no Tom Hiddleston, who I think is the best actor in the business at the moment. (Along with Benedict, imagine him in a super hero movie?)
TDK had a great cast themselves; but I'll take RDJ, Chris Pine, and Samuel L. Jackson as leads over their leads any day.