i don't know about this... on one hand, i love me some avengers. on the other hand, only 5 characters at launch and the dreaded "games as a service" nonsense.
with marvel heroes, the game didn't necessarily change based on who you were playing as. so fundamentally every new hero was just a reskin with different powers. if marvel's avengers separates characters by HOW you play the game then it would make sense for a slower rate of additional characters. if black widow plays more like splinter cell or something and thor plays more like force unleashed, for example. maybe bad examples, but whatev. i don't know how i feel about this anyway.