I may be a little off here but when I leveled Colossus, I noticed his signature power was pretty much the same mutant power from the X-Men arcade cabinet. Gambits signature was the "Royal Flush" from every Marvel fighter that featured Gambit. Spider-mans ultimate is the same from the fighters as well (and has the same name?), with him charging on the X and Y planes respectively. There are many others such as Cables beam or Storms weather stuff that, well, there's not really any other way to do those. (Like Captain America throwing a shield). So- back to the original three, Colossus, Gambit and Spider-man... does anyone know if they were taking ideas from the earlier games? If so, I applaud the hell out of it and I would hope to see a lot more.
X-Men Arcade and Marvel's Fighters are so iconic, I see no reason to not use them.