I only have GHII, I've beaten and 5 starred easy and medium, beaten hard, 5 starred most of hard, stuck on the last two setlists, almost beaten expert, again stuck on the last two.
Also, because I feel like ranting, I hate people who say to people that play Guitar Hero: "LOL GAYTAR HEERO LOL IS NUTHIN LIEK REEL GUITAR U IS A POSER GO PLAY REEL GUITR NOOBCAEK LOL!!!1!shift!!111one!11".
I probably overdid it, but the point remains.