I've watched a lot of discussions about this from twitch streamers and I'm not sure where I stand.. On the one hand I'm amazed at how good this game looks on mobile and if you're just the type to casually play a game not really caring about being the best at it you could have fun playing it for free or for very cheap. On the other hand this game is clearly exploitative and while other games like Hearthstone or Clash…
I played a wee bit and it didn't seem that bad. You can pay to upgrade your gear, but that seems entirely pointless in an ARPG. The whole game is a grind to get better gear! Once you actually have perfect gear, why keep playing?
My issue with the game is that it lacks depth after having spent far too much time playing Path of Exile. There aren't that many possible builds, and the game basically tells you exactly how to build if you want to do PvP or PvE. As far as I can tell, those builds are the meta ones, so the designers are forcing the meta.
But as a game to run in and kill some monsters without thinking too much, it seems fine. Which makes sense since it's a mobile game.