3) 3v3 helps balance the risk/reward of assists much more than a MvC1 system. In MvC1 you throw out Colossus whenever you feel like it, and if he doesn't accomplish his goal - oh well. In Marvel 3 a bad assist call can lose you the game, and a huge part of the game is manipulating the screen to ensure your assist call is protected. Contrast that with MvC1 where assists get you in for free.
this is a good point
who would replace colossus, psylocke and sentinel for the 3 assists you always pick no matter what
who