I Echo this (apart from the HP fan bit, not that I dislike HP but I've never read the books and only watched the films for the sake of the Mrs).
It's a bit frustrating as you can see where it could go from here, but this game isn't really making the most of either the setting (apart from Hogwarts of course, which I maintain should have been the whole game plus the odd detour to Hogsmeade) nor the gameplay elements. It's decent enough, and a solid base, but overall lacks real depth to any aspect.
Having said that
@devilish it does depend on what you look for in an OW game. If it's running around doing missions as a time killer and something casual to drop in and out of, then this works for that.