okay. let's lay some knowledge on you dum dums.
Guitar Hero was originally the most fresh idea that had come from music games since DDR included a dance pad and was released.
it was made by a then-indie group (still indie, but more known), Harmonix.
Harmonix had already made at least two (i don't know if they had previous games) AWESOME music games, Frequency and Amplitude. they were sleeper/cult hits, and the latter (amplitude) had online play. Red Octane supplied the controller, harmonix supplied the game itself, sweet sweet gaming love created guitar hero, which went on to win some award at E3, and later they made (naturally) guitar hero 2.
at this point, activision took over the guitar hero name, and red octane stayed with them. harmonix went on to make rock band, and revolutionize the music-game genre, AGAIN, by adding in extra instruments, and by adding in a very nice DLC system.
guitar hero failed to keep it up, and after an initial bang that GH3 had, they flopped and churned out as much as they could. now it's dead, after Rock Band 3 has been said (by Harmonix) to be the last in the Rock Band series.
guitar hero 3, and all of the preceeding guitar hero games were not made by harmonix, and thus were not as high quality as the original two were. they were not made by the same people, and were not being managed the same. i may be a huge harmonix fanboy because of it's dedication to quality, but if you look at and play the games, you can tell the difference. if you don't, well, that's your own loss.
if you believe guitar hero only had rock songs, you're obviously not educated on guitar hero at all. as long as harmonix has had the reigns, there has been a wide variety of genres, all fitting VERY well. all of them have to fit with a guitar, since, derp, you play a guitar, but there is a nice mix of rock varieties. rock band added in plenty of drum and vocally-suited songs to make those experiences fun as well.
if you don't want to play a fake plastic guitar to rock songs you love, you probably shouldn't be playing guitar hero.
can't wait for harmonix' reboot of amplitude. ****'s gonna be so cash.