Contest of Champions is one of the more popular Marvel games. It’s a character-collecting title. Your goal is to collect as many Marvel heroes as humanly possible. The game also features light fighter game mechanics, an online multiplayer mode, and a sort of campaign mode to follow.
The combat mechanics are also okay. The downside is that it is a freemium title. Thus, there will be elements of that thrown in there from time to time. It’s fun for a while, anyway.