I think with my ower 3000 hours of experience. And the fact that I tryed out every single class as lvl 12. I beated the game on tactican w/o prebuffing and potion abuse. I can tell the worst class is moon druid. But only because it have too much bugs.
Mybe later it will change Idont know. But it's bugged from 2022 August. So I lost my faith. Every single class is better then moon druid even with multi class in mind.
Mostly because attacks don't count as magical. That's mean after act 2 the moon druid can only do 1/2 damage and there are enemys that are completely immune to non magical attacks.