19. Marvel Heroes (2013)
Licensed online games have a problem: everyone wants to be the cool heroes. Usually they allow players to make knock-offs of the original characters, but Marvel Heroes just shrugged and let everyone play whoever they wanted. Sure, you might be fighting alongside five versions of Hawkeye and two Black Widows, but maybe they're from alternate timelines and also, look over there! Rocket Racoon and Scarlet Witch! A decent clone of Blizzard's brilliant Diablo hack'n'slash classic, Marvel Heroes became something more by throwing up its hands and letting players play the heroes they wanted.