That's exactly what I go into in my review. When I first played the demo and realized it wasn't Bayonetta 3, I was kind of like "oh". And then, getting through that and the beginning of the game, I felt like it wasn't really going to be a great game.
It grows, though, like a pot coming to boil. It doesn't hit right away, but it starts getting its hooks into you. And, bit by bit, you start to realize that it's going to be a better game than you expected. And then, it does to make you briefly go back to that "oh" feelings—but then it pulls you back in, and ramps up ever more.
There's plenty of games that I've played where I knew of their quality or had a good feel for what to expect in the first hour, if not 15 minutes. This absolutely isn't one of those games.