I used wolverine, Storm, Cyke, and collosus. I kept Collosus on there because is power punch when used with storms lighting or cykes blast did massive damage. Plus if my guys were low on health i would just use colosus shield like power and send him in the middle so everyone else could get away. i had wolverine in there just because Wolverine was a poerhouse in the game.
Any XML 2 is gonna have Juggernaught in it. I wonder how that is gonna work. If he is as powerful as he was in the ilsand fight in XML 1 he could be all you need.