Enemies are too intimate

Pretty much every single type of enemy has a some kind of charge/rush ability or just ridiculously fast movespeed that they can use to come to the hugging distance with you, and that is extremely annoying if you’re playing with a squishy class.

It makes the harder fights ridiculous when you have to spend most of your time running and occasionally throw a spell/attack at the enemy.

Sounds like you didn’t invest enough in defense. You don’t get to be a glass cannon in Grim Dawn, even if you’re playing a caster.