3 1/2 skulls out of 5.I thought the animation was definitely better than anything else Marvel has done (X-Men and Spider-Man are AWFUL). I agree that Capt America's characterization was quite good and it would have been nice to flesh it out a little more. I think the length of the movie as a whole was a little weak (70 minutes??). They could have made it a little longer.
The story line with Hulk was cool. I also am just kind of discovering Iron Man. I like the concept, and Stark is a cool character. Will have to check out his monthly title(s).
Looking forward to more Marvel titles of this (or better) quality.