Upon starting this game I was very sceptical about its contents and how they can release a game weeks before the years biggest film without giving away the story to the average public. If you have read the books and know the story already, this game is very enjoyable and the plot holes will not prove a problem.
However if you only watch the films and have not read this book, the game will leave you very confused and disappointed. It follows the story of the books, but only very briefly and misses out key items about the plot, making it near impossible to understand the game without prior knowledge of the story. The game is reasonably long for many games of this genre, but still only takes 15-20hours for full completion and has little replay value.
I would suggest it is a very worthwhile game for 8-15 year olds who are already very interested in the Harry Potter franchise. Even with these problems in the game, the gameplay is excellent and I personally as a big fan of Harry Potter thoroughly enjoyed this game and it kept me glued to my DS.