Well I wouldn't say guitar is completely worthless.
Some one who has never picked up a guitar and plays the game first has an advantage over someone who picks up a guitar first.
It's a baby step for doing two things at once, strumming w/ one hand and placing your fingers on buttons in sequence and combinations.
Heck power cords aren't that hard to play.
And I would say it helps with listening.
Before I picked up a guitar I had a hard time picking up guitar sounds. Seeing a visual representation along with the audio I would say is definitely helpful.
But yeah it won't make you jimmy hendrix. One of my friends plays the game and then tried a real guitar and he was frustrated at the fact you don't always strum every string. And he had no clue on how to hold a chord.
So if you are incredibly dense and expect guitar to be easy that it I can see where it does some harm.







