I'm revisiting Grim Dawn currently. I've never played a caster in that before (my last character was a sword and board tank type using Oathkeeper mastery), so this time I'm playing a wizard type using Arcanist mastery. I'm trying for a "Panetti's Replicating Missile" build. That spell seems to me to be almost surely inspired by D&D Magic Missiles. There was a similar ability in Torchlight II called "Prismatic Bolts" that was almost the same idea.
Everything I read says the Missiles build for Arcanist doesn't do well on higher difficulties, but I usually just play through Normal level of an ARP before I'm ready to play something else, and it's fun for now.
I've played a lot of ARPG's, so I have a good basis for comparison. Hands down the hardest ARPG I ever beat on Normal was Diablo II, where "hard" is measured by overall danger of dying at any point in the game. I think Grim Dawn is a very close second to that, and the aesthetic of Grim Dawn matches Diablo II, even though it's built on a similar or same engine to Titan Quest.
Titan Quest is a much brighter and more colorful looking game, though, set in a fantasy version of the ancient world including Greece, Egypt, Asia, and North Europe. Grim Dawn is set during a zombie apocalypse, and the tone is very dark, with lots of browns, blacks, sickly green, and shadowy lighting. Since I prefer a brighter aesthetic, Grim Dawn is really not my favorite ARPG by a long shot, but I'm having fun with it for now.