From what i've seen, every fighter can turn into a button masher.
You're obviously not very good at the game, otherwise you would realize that it is not at all a button masher.
It's not a button masher but it definitely can get ridiculous sometimes.
X-factor and some other things are pretty retarded.
I've been gettin a stupid amount of ranked wins spamming the same crap over and over -____-
MK will have much more replayability and it shouldn't be too hard for it to be better balanced than MvC3. Still though, MvC3 is a pretty fun game - it's abit on the casual level but at the same time, good players can dominate.