40k Martyr is decent if youre into rogue likes. Last I played it was still very barebones though. Enemy variety is Cultists, Word Bearers Marines, Nurgle Daemons and Rogue Guard. Weapon variety is ok, except some weapons are completely frigging useless
As a seasoned Grim Dawn player, I'd say I don't see anything wrong with a slower paced gameplay. After the sanic freakshow Path of Exile was for me, GD is a solid middle ground, especially if you're playing on Elite onwards. Warden is just the beginning. :)