+1 to it being weird that the enemies you fight seem to operate on different rules. The gnolls were a nasty surprise for me that wiped me the first time I fought an actual group of them.
+1 to the class distinctions being a bit weak, but I'm guessing that has more to do with being EA (hopefully, otherwise the game will be weird) and that additional specializing perks will come up like in DnD 5e.
However, in-universe I believe the reason for the Paladin being wonky is because he's actually an infernal cultist pretending to be a Paladin of Tyr, which is why he gives you his sacred holy sword (!) as a quest reward for providing the head of a parasite-infected tiefling. Really makes you wonder what's up with that, huh?