Don't let the title for this article mislead you, folks. The actual co-op in Marvel Ultimate Alliance was great, and that seems to be unchanged. There were some problems, though, with adding players, changing characters, etc. The interface was a bit tedious when these tasks needed to be done. According to Aeropause Games, after a sneak peek at M:UA2, this stuff is much better in the sequel.
Now for those that complained at great length about the co-op play in the first Marvel Ultimate Alliance, you voices have been heard. Co-op has been completely revamped from top to bottom and it will be easier to join games, and choose characters. This is a big plus in my book as co-op was such a chore in the first Marvel Ultimate Alliance. I was never able to select characters properly when less than four players were playing in co-op, and it never felt 100% stable.
The preview is definitely worth a read, revealing some really interesting Fusion combos. Thor summoning a whirlwind, which the Human Torch fills with flames is perhaps the coolest. But Storm using Captain America's shield to fry a whole screen of enemies doesn't seem too shabby either. We're really looking forward to getting our hands on this game, for sure!
Source: Aeropause.com