Sorry for the very late response, but I played Grimm Eclipse with my ex-boyfriend three years ago and it actually wasn't all that bad of a game.
From what I can remember...
PROS - Fun moves, unique monsters, nice music, spammable voice lines and shit, cool costumes
CONS - Repetitive af (gets boring after playing once), lame ass story, co-op and multiplayer suck balls
I'm going to re-download the game and give it a shot. Maybe it's changed... or maybe it's way worse than I remember. Wish me luck fellas.