It's insanely, retardedly hard. If you don't like a challenge, never play it. It's only worth playing on normal difficulty and up btw, otherwise you're not really experiencing the brutal, soul crushing difficulty the game has. I played several chapters on PS3 and gave up so I could wait for the inevitable trophy patch/version.
Maybe on Very Hard/Master Ninja. But Hard and Normal is EZ if you know how to block/roll and XY->XXY(SquareTriangle->SquareSquareTriangle)/Izuna Drop.
Does that include NG3? Also GoW is better than peasants.
NG3 is the abortion Bayonetta had after God of War came into her room. My lord Ninja Gaiden: Black doesn't speak of that episode for good reasons.