From the little I played its. Basically boiled down to a few points of contention for me personally.

1.) Camouflage, yes this desperately needs a buff, especially with Parry nerfing making an already iffy skill worse.
2.) Brutal Shell, yup why is this SO weak? 100% of damage dealt as the HP+shield otherwise what's even the point?
3.) Bow Shock should be 20s
4.) Potencies of the Gnashing Fang combo needs be upped by about 10 to 20 per.
5.) This one is just a small gripe, but the animation lock and range of Rough Divide makes it feel really odd.

Other than that though GNB feels great to play, its busy without being tedious and there's a lot of promise in it!