My thoughts echo @Ephraim’s after 40 min with my 6yo. Run around co-op together smashing zombies and skeletons in Minecraft world. He loved it and I get to introduce him to the concept of arpgs. I am surprised there is anyone that really thought this was going to challenge POE or Diablo or Torchlight et al in terms of mechanics or difficulty/skill ceiling.
Runs a bit crappy on Switch, hopefully a patch or two smooths it out.