Well Guitar Hero World Tour and Metallica has kept me playing the series simply because if I get bored of guitar I switch to drums or visa versa. I am just waiting for a Joe Satriani version of the game or at least a decent song pack to purchase.
Well it has gotten repetitive and now I don't even want to buy Smash Hits even though it has some of my favorite songs on there (cowboys from hell, beast and the harlot).
Guitar Hero had a good run. Guitar Hero 3 was the line of separation. All the Guitar Hero that came after that were terrible. They tried to compete with Rock Band at that time. Rock Band is now the new thing man. I love trying to be better at the drums, not really at vocals because all you need to do is make noise really.
i bet it would be funner with drums but im boring of guitar hero when i first got it i never stopped playing it but metallica i play because i love their songs