In defense, guitar hero is amazing. Most people hate it cause they suck at it, little to no hand-eye coordination. The worst game I've played is the recently released Cryostasis - Sleep of Reason. Played it for like ten minutes. You constantly go through flashbacks and very predictable fights.
Well, I have an old Atari 2600, yeah, that my cousin gave to me, he gave me the game ET with it. I immediately saw it and I was like "nooooooooooooooooooooooooooooooooooooooooooooo!" Hearing all the bad things about it before. I decided to play it and it was horrible.