I'd been a bit wary of playing Durge because the first few descriptions I'd heard sounded a bit murder-hobo-y or like playing as Trevor from GTA 5, but I'll give it a go and see what it's like. Got a few other games I want to play first though.
I hope you do try it, it's not so bad as you may think! And it adds a whole new experience on the game, almost like a baked in DLC.
Raphael is my favorite fight because of the song. When I hear the small snippet in Act 1 I just smile like a dummy.