I liked this game becuse it is fun and hard at the same time. I play on expert and can tell you it is much harder than the last three by far. If you have played the others then you need to play this game but if you have not played one of the others you should think about getting those first becuse GH 2 had some really good songs too and if you play it first it will be a little easyer to play GH 3. There are some fun ways to play like battling and co-op, with some really good songs.
The online play is really cool if you challange someone who does not quite half-way just becuse your wining. You may also be suprised if there are some online songs that aren't on your profile. That is becuse to unlock all songs you need to play co-op. Over all good game.