Very empty, frustrating, often quiet levels and a by-the-numbers action story/characters. That said, I love the combat system to bits and I've replayed this game multiple times just to get into it.
It's hardly the level of a fighting game, or even something like Devil May Cry or Bayonetta, but it feels like one of the best translations of the old beat-em-up formula in both combat and difficulty. You constantly feel like you're barely scraping by; every single health pack feels like a blessing and just when you think you're getting the hang of things, the enemies get significantly harder and the spaces between checkpoints feel more and more brutal. I still don't feel particularly good at this game but it's immensely satisfying when you learn to overcome the insane challenges and there's a surprising amount of versatility in how you can beat them.
I also deeply love the clear Otaku influence all over this game. The whole thing is just a big celebration of anime tropes including poor attempts to accurately replicate the traditional manga/anime artstyle and a protagonist that borders on copyright infringement - this could easily have been a licensed Ghost in the Shell game in another timeline.
Flawed as fuck but I really like this a lot despite everything. Has an active modding community!