I just bought a 360 and MvC 3. played it for the first time actually. I tried doing the missions and failed terribly. it's a lot more technical than I though it was.
I think I'm gonna be playing X-23 but IDK who else. I like doom/trish/ammy/chun-li but IDK if they work out in any way.
x23 on point (for dhc trick) or as anchor (otg assist/unblockables, silent kill and xfactor shenanigans)
ammy and trish have dhc trick capable supers, but I think if you got some of the advanced bnb's down with x, then weapon x prime into slow super with ammy and loop 236L sword you can kill any character, so probably the better choice
you could probably just play ammy on point for the heck of it too, she's a really solid character
doom rocks is really good for x23's mixup game, or you can probably play a really mean keepaway game with doom/trish or otherway around
chunli is also pretty sick as anchor and her legs assist locks down pretty well, but dont know much more about that character
I started with hulk/doom/x23 but trying to change it up a little to x23/(morrigan/dante)/doom because I feel hulk is a bit limited in use