Just a heads up to people that complain about "short" games (you know who you are), well here's another one to add to your hit list. People are clocking in times of between 7-15 hours on it (7 hours if you usually finish your games quickly). So the average for the game is likely to be somewhere in that range.
For some who're going to try to argue about collecting all the stars, etc, keep in mind that those who've bashed shorter games on the 360 and PS3 didn't feel that such things were enough (collecting achievements on 360, etc) to offset a short game so expect to get the same feedback here, especially since those times include collecting and unlocking almost everything.
The game is apparently pretty good so maybe people should remember that the quality and experience of a game can sometimes make up for it's length. Also this game like Heavenly Sword likely has good replayability so don't let the haters get to you and just enjoy it.