Personally, I would buy 3 copies of Diablo 4 (one per kid) if it's on steam, but not on blizzard.
Enemies all feel the same, quests and events all feel the same, almost literally every minibuss and even some major bosses have this dumb ass mechanic where they summon ads which make them invulnerable, seriously it's the least interesting game mechanic in the world and they overuse it so severely it's honestly a big part of why I didn't finish the game.
It's just not fun, let me kill shit. The whole point of ARPGs is to get powerful and kill things fast.