-Added videos to my OP to showcase some of the bugs.
-Changed description of bug #5. It wasn't actually ice causing the fps drops - it's a combination of venom coating + dizzy / sickness animation of lizards. Video included.
Can't agree on your third gameplay point. With two infusions and max summoning your incarnate is on par with any same lvl npc you are facing until the very late of the game. I think it shines mostly around lvl 8 when its spells deal almost twice the damage of a spell caster going full int. And later on it is just a good distraction tool against your enemies.
I don't know how you can disagree with me here. It's a matter of fact my incarnate has only around half the HP and armor of my average party member, NPC have usually more HP and armor than my average party member and NPCs deal enough damage per hit to kill the incarnate in 1-2 and my party members in 2-4 hits. Summoning skill is at level 6, party is level 12.