Game wise:
GH2>RB2>RB1>GH1>GH80'S>GH3>GH:A>GHWT/M (Both as bad as eachother, read: rubbish)
Guitar wise
RB>GH3>GH2
The only reason i'm not a fan of GH3/A/WT/M is because;
A) The gameplay is horrendus, doesn't even feel like i'm hitting the notes
B) They're too easy, I can now pass TTFAF consistently, and have almost not trouble on any other songs, Whereas Visions still kicks my ass on RB2
C) The fanboys who complain about Rock Band copying, when since 3, it's the other way round.
If the current GH's played like GH2, then all would be good (yes, including the no band thing).
As per the norm, i'll probably get moaned at for GH bashing now.