It's alright to play. The problem comes in when somebody who is GREAT at Guitar Hero thinks they are equal to a guitarist. It's as if because you ruled on Tony Hawk you could claim to be as equal with a real skater.
haha no delusion about that--although Ive heard that if you are really good at playing the drums on expert in rock band that you actually are learning the basics and can play the drums in reality (although Ive never played it)
i just like the fact that its a game (guitar hero) you can throw in and play for 10-15mins without having to get caught up for an hour playing it.