After playing those games this weekend I liked all 3 for the most part:

MK Vs DC: The last MK game I honestly played was MK3, and I was highly dissapointed with some of the later ones that came out for PS2...etc. However, this was pretty sweet, its easy to pick up, the online play is pretty good, quick and easy fun. Sub Zero ftmfw. Im not a DC person but the story mode is pretty good.

GoW2: Havent tried Multiplayer but the single player is awesome once again, cant wait to finish it out.

RE 5: Played the first chapter out and had to put it up for the night. Good game so far from what I can tell. Just have to get used to the controls.