Yeah let us just forget that Sentinel has some of the best assists in the game, highest damage output, ranged and close ranged attacks, one of the best beam ranged attacks in the game, super armour, ground and air supers and the biggest stat increase when in X-Factor. Learn to play the game and stop whining.
Playing some MvC3 Mission mode, 310 missions done just 10 more to go
Hard Corps Uprising - Krystal is coming right in her Zero Suit Samus outfit

almost finished the game.