This game is unironically not that bad.

Yes, it doesn't play anything like the 3D Ninja Gaidens before it. It's not very polished. It's not even super original being mostly a GoW clone with some NG ideas thrown in.

But looking past that, it's perfectly fine as a silly spin-off. The gameplay is mostly serviceable. It's actually funny as fuck and Yaiba specially is hilarious. I think it's worth playing at least once, just don't expect it to be a proper NG and take a suck.