I've only ever played GH2 for PS2...
only once, but for a good hour or so..
it is hard at first, but it's something you have to get used to.
you get better the more you play...
and i had a weird experience with it...
after playing for a while, after a song, i noticed my whole left arm had gone numb.
yes... i lost all feeling in my arm.
it scared me, so i stopped playing.
my arm felt weird the rest of the day.
i guess it was the way i was holding my arm or something, i don't know...
maybe i was just pushing the finger buttons too hard... a noob mistake perhaps?
i don't know...
I would play it again though, it was really fun and I was getting good at it too