Still playing a fair bit of Marvel Heroes 2015. It was shit when it first launched but they fixed a lot of stuff and it's very playable now. It's even more enjoyable than Diablo 3 (even though it's basically Diablo 3 with Marvel skins.) and has a lot more shelf life - once you're done maxing the levels on all of Diablo 3's classes, that's pretty much it. Marvel Heroes comes out with new hero characters on a monthly basis so there's always a new character to learn and level.
Only downside right now is if you're heavy into lore. Lore accuracy pretty much goes out the window when you see 3 Juggernauts, Silver Surfer, Thor, and a bunch of Hulks having trouble taking down Batroc the Leaper.
Also, I found out that I don't need to spend money to get access to the exclusive costumes. Just farm in game currency for one of the cards or blender default costumes and let the luck of the draw give you the really expensive costumes.
I just got Captain Murrika's Winter Soldier costume this way.
