MvC2 is horribly broken in terms of balance, and lacking in terms of that usual polish (ie. omg ugly backgrounds and soundtrack and recycled sprites) but its kind of like a really insane candy. Sure, the subtlety is completely gone and its just rotting your teeth at the speed of light, but woooo what a ride.
I still have it for Dreamcast so I dont care if it comes out for live at this point.