In a review I hear this game could be beat in an hour and that there isn't much to do after. Normally I don't mind if a game is "short" but is realy good, like Vanquish. But 50 bucks for an 1 hour game ? I think not even Zelda fans would pay this much to play that tech demo from E3 let alone a gesture based game with nothing to do after.
KeeperX already hit the nail on the head, but I'm going to expand on it a bit. Each of the NES Super Mario Brothers games can be beaten in an hour. Same goes for the Sonic games. You can clear Street Fighter II in like, fifteen minutes. After you beat them, there isn't "much to do after." Unless you... replay them. And that's exactly what kids worldwide did, over and over, to get better at them even when they already knew how they ended. Why? Because it was fun!
It's no big deal if Child of Eden just isn't your style of game. I'm down with that. Not everyone digs the Space Harrier style lock-on gameplay and all the synesthesia hub-bub. But people bringing up that the game can be beaten in an hour as if that were a major problem continues to baffle me.