Subject. While it does clock in at two hours, it does seem to come and go a bit too quickly. Most importantly is the "rivalry" between Jane Foster and Sif being hinted at (twice), but never going anywhere. At times, Loki stole the show in terms of just being there and while he's a joy to watch, I think he's going to be a bit too overplayed.
Still, movie is balls to the wall hilarious at times, (*SPOILER*) especially when we see Loki as Captain America. Overall I think the first Thor was better but this one was certainly pretty awesome.