I played MK vs DC for about 3 months, then got bored of it.
The gameplay felt a bit sluggish, to me.
Free-fall kombat was more of a QTE system which really took NO SKILL whatsoever to do, you just had to guess right.
Klose-kombat was "meh" at best.
Lastly, Rage Mode was stupid as hell. In Rage Mode, the other played couldn't be touched, so it was f***ing ridiculous when you played in ladder mode on harder difficulties, because the AI would always go into that mode.
Superman, The Flash and Scorpion all had infinites that were constantly exploited, so people would only use those characters online, to boost up their win status.
That game had a lot more wrong than right, IMO.
I didn't care as much about T-Rated fatalities, because it was pretty much a given anyways.
DC didn't want Superman's head ripped off his shoulders, so Midway had to do fatalities that were more cartoonish or toned down.