Several players have pointed out the aggro of pets is lacking. I agree with this idea and when i compare with Diablo 2 or 3, the pets for some reason got aggro much more easily. It makes the using of some skills sometimes tricky, far from uber hard or impossible, but still sometimes tricky.
I would also like to suggest improving the pathfinding of pets. On a popular build, the author pointed out that when he combines all the pets from skills with the pets from Primal Instinct, this can cause pathfing problems.
Yes i know this post is very pets oriented but they are my main reason to play Grim Dawn^^