So I'll say what I think about the reviews:
They seem about right. This game does not have the appeal of Bayonetta and the controls in the demo were pretty...eccentric. As Kamiya makes more and more games, being the face of each one more prominently, getting bigger teams, more vocal fanbases, people are going to expect that these games aren't just for fans of his games, they're good for everyone.
And it seems the opposite is happening. He is making games for dwindling amount of people each time that will like his next project, the next thing he personally finds cool.
Will be interesting to see what he does next. Fans won't abandon him, but I hope he doesn't abandon his specific style in the face of bad reviews. Hard to tell how this game will actually be until I play it, but he hasn't let me down yet.