Mortal Kombat has been around for a while and it has a certain fan base that its built same thing for the DC comic book universe. People said this swayed way too far from the Mortal Kombat roots and if you think about it that was true but the game had solid fighting mechanics actual in game videos that fans of Mortal Kombat had asked for for a long time. The roster was solid each character was unique. Thats the thing about alot of the older Mortal Kombats the ones before MK vs DC at least alot of the characters had similar moves and specials.
The fatalities were pretty cool to but they screwed up some of them like the one that Joker had with the gun but then they edited it to show only the Jokers face. They could have done one thing though it probably would have reduced the interest of alot of the younger fans but it could've worked. What if MK vs DC had only villains from the DC universe maybe then they could have had alot more brutal fatalities. They could've even tied that to the story like what if Lex Luthor was trying to travel to other dimensions and stuff and he gathered all the villains and told them that they would invade that dimension or something like that.
Also the endings were awesome i don't know what anyone else thought of them but i thought it was cool when they were like Sonya becomes a green Lantern or Sub Zero adopts Batmans look and personality and like Captain Marvel gets new powers . That could've been furthered as DLC and I think it would have been pretty cool to see that stuff happen. In conclusion it was a pretty good versus game it got Mortal Kombat new fans and same thing for DC but it could've been better if the licensing problems were solved.