I agree with all of this apart from the goemancer and the necromancer (kinda):
I feel like both are pretty useless at the moment because you can't deal any poison damage to skeletons (since they're immune) and they become the main enemy after leaving Fort Joy. Although some skills are good especially when combined with other ones. Same goes for necromancer, blood rain and other skills don't affect skeletons which really annoyed me.
Those 2 classes are the weakest in my opinion at the moment.