I've played Grim Dawn and all DLCs for around 500 Hours now, both COOP and Solo. It is honestly one of the best Games I've ever played. The skill system is like Titan Quest, you can combine two classes and create a unique build and on top of that you get a Devotion System where you can skill passive abilities, like Path of Exile. I created dozens of builds now and it feels still rewarding and never boring to get through the content again. There are also so many optional areas and dungeons which are also challenging and rewarding. I recommend this game to everyone who likes this genre, I promise that you wont be disappointed.