When I played RB in my brothers, I had a feeling that I strummed and at times it didn't recognise but persuaded myself it must've been me being crap or something.
Seems there is a problem with guitars strumming down and there's a fix for it, I'll be looking into that I think. There also seems to be a problem with the tilt sensor not working right, which was also something I noticed and I'll see if I can tweak. Funny really, I also had to open my Xplorer guitar that I got with GH2 as the whammy bar didn't work on that (another common problem) and that needed opening and tweaking.
Jay, there's 3 kinds of drum sets. EL (mine) is the first version and the sensitivity is worse than the other sets. Then there's another (QW or something) where apparantly the sensitivity is slightly too much. Then another set but not much is known about that.