My one concern, however, is the run time. For some reason I see that it's close to 3 hours long and wonder if there will be some plodding parts. Hopefully those feelings are unfounded.
It's 2 hours and 45 minutes long, only 10 minutes longer than it predecessor, 25 minutes longer than Batman Begins and 20 minutes longer than The Avengers.
I don't think it'll be that bad.