I think this one of the best Harry Potter games made.
Its graphics are lacking in excellence but it has fantastic gameplay. The levels are different and there is even a quidditch mini-game if you get bored of playing the proper game (but that never happens).
Its just right in the difficulty department and doesn't skip on the excitement. It took me about 3 years to complete it. I reckon its a brill game and you should buy it or at least play it (trust me you'll be hooked). The sound matches up to the parts were there supposed to be and I say its amazing in almost all ways.
I give it a 8.0