More of the same. That's my summary for those of you with short attention spans. If more of the same is what you're looking for in Marvel: Ultimate Alliance 2, then you won't be disappointed. For the rest of you, you can still have fun with the formula, if you have the right group of people.
Ostensibly Ultimate Alliance 2 concerns the huge Civil War that strikes the Super Hero community when Nick's Fury's vigilantism encourages America to pass the Registration Act, requiring crime fighters to reveal their identities and work for the government. While possibly one of Marvel's greatest storylines, it loses a lot in translation. The game plays like a "best moments of" recap of the Civil War, never going into much detail about what's going on or the emotional turmoil that the characters are thrown into by the Registration Act.