There are worse ways to spend a Saturday!
The controller that attaches to your DS is awkward, I admit. But the secret to not getting a hand cramp is to not wear the strap attached and to lay your hand on a table so it doesn't get tired. With this method, I can play for nearly 1 1/2 hours before I need a break.
The graphics are great, pretty much what you'd expect from the franchise. The songs are really good, especially Weezer's "Buddy Holly." That song alone is almost worth the money. I rated the game as Very Hard because getting a perfect score in all the songs is amazingly hard (I haven't finished it myself), but newbies shouldn't worry - the Easy level is fun for everyone.
In short, I would recommend this game to all Guitar Hero lovers, even though it's not as great as the games for XBox 360, this DS version has a lot to offer rock fans.