As far as a game where "players learn the guitar without realizing they have been taught" as Ubisoft claims? That's a statement that just isn't valid. Jam Sessions is more a "game" than ever, and while it works, is fun, and a valid music option on DS, it's going in a very different direction than the original would have gamers expecting.
Presentation - 5.5
Graphics - 6.0
Sound - 7.0
Gameplay - 7.5
Lasting Appeal - 6.5
Overall -
7/10