This game is really a decent continuation of the first game (Lego Harry Potter Years 1 - 4). It's sooo much fun in lego stlyle, it's definitely a must have for every Harry Potter fan. Team of creators are so into Harry Potter world, you can really sense that - there are so many small details available (let me mention, for example, Ginny's pet - pygmy puff Arnold or Dumbledore's cursed hand).
Only thing, I can't really explain this, I have a feeling that first game was better. It's in the same slyle and there's great things included, but something is missing. It's almost like a scheme "How to make a great sequel"... Don't get me wrong, it's an amazing game, but something is not there.