I like it a lot. Fights could easily get repetitive were it not for the variety of characters at your disposal (good guys and bad) and their signature moves. Never any need to do an IAP and there's a large variety of quests and ways to level up your characters and they add content all the time - there was a big Ultron…

Only a few X-men though (Cyke, Storm, Colossus and Wolvie are all that come to mind - Illyana isn't even classified as a mutant in the game). Deadpool has by far the highest profile.