Great game, pretty short for the $15 starting price
Journey is all about environment. The wide spread environments and seeming lack of objectives make the game feel like you are truly exploring. This isolation contributes to the need to help or be helped by other players. It really makes the experience great. While the game is very short (around 2 hours for me), it is loaded with moments and vistas that keep you wanting to play more.
I guess that's where my score comes in. I would like to rate the game higher, but I can't give a game a 9 or higher if I don't feel like a person gets their money's worth from the game. If I paid good money for another high quality third person title (pick your favorite) I would expect at least 10 hours of game play. It should be a game that I need multiple sittings to experience fully. I don't feel like Journey delivered this, but it is still a great game.