My main complaint about Asgardians...

is that other than Heimdall or mabye Odin, none of them act their age. They're supposed to be hundreds or thousands of years old and yet they don't act like it. Compare that to some of the elves from LOTR like Galadriel or Elrond or Thranduil, and they at least have some sense of timelessness about them. Some of the vampires in True Blood also have a certain precense to them that makes you believe they are indeed centuries old regardless of how carnal their actions are. 

I guess I just wish the Asgardians exuded a certain... gravity... that would make you believe they truly were as ancient and as advanced as they're supposed to be.