I finished the seven books in a row and felt orphan of this marvelous wizarding world. As I waited for the next last two movies to watch them all (so far I have seen only the 1,2 and 4), I decided to play the video game with the kid.
We found this first opus great because the game has amazing graphics: as someone else said, it is like a virtual visit of Hoggwarts. In addition, the gameplay is easy and it is made for kids: the level asks for quickness and a bit of reflexion.
On the other side, the game has major flaws as well: first, I don't think it uses the John Williams' theme and it is a pity. And above all, some levels are impossible to finish: the quidditch games, the troll chase and for sure, the fight against Voldemort!
In conclusion, a good game but it needs the six other to be perfect!