I bought the game after watching videos, it looks like it will be good.
I've never watched a single Harry Potter film or read any books (and probably never will).
But the graphics and game-play look good.
I'm an "Open World" gamer, and will give most Open World games a chance. This one looks like they did a good job with the world/environment.
Also It appears that you can go into most of the interiors, which by itself is crazy.
Most Open World Game Devs, have only a few buildings you can enter/explore.
I'll be playing over the weekend.
Keep us informed on your experience with it....