ehh i thought marvel heroes was too basic and simplified to really get into it.
Grim Dawn is the next best thing right now. it doesn't have the end-game content PoE has, and is it a bit simpler overall, but the combat is fantastic(and smooth as butter) and the campaign is a blast to go through with a ton of secrets. it's a lot more fun than rushing to maps in PoE, although like I said PoE's endgame >>>
it's a lot of fun and a nice distraction to PoE if you're bored of it or are LOCKED like me.