The encounters are not difficult at all and the AI makes sooooooo many poor decisions and pointless turns that it's ridiculous.
It's EA, so I'm not criticizing but I've had:
1. The AI come all the way down a ladder from high ground to cast Cure Wounds on another enemy.
2. The AI waste turns by walking around before finally doing nothing.
3. The AI cast a spell or shoot at me and the attack hits the ground.
4. The AI willingly trigger AoO and die
And so much more. I hope that on harder difficulty the AI is much harder along with the enemies. Buffing the enemies alone doesn't mean anything when Larian has the AI for these enemies as very stupid.