OMG this game is amazing. Put in a couple hours now. The whole white/black 3 button thing didn't really click with me until about an hour in, and when I felt it click I felt like a badass (well as badass as one can feel on normal difficulty). Had dropped it down to casual at first because I was getting so messed up. It ends up like old Guitar Hero since it was just using 3 of the white buttons, and I was playing it like old Guitar Hero (old habits die hard). But once I made the switch, whoa.
The live crowd is genius. When they are all bouncing up and down during a fast song and you are rockin it out, I actually got chills. I mean, everything is so clear and clean (image quality wise).
Also have had no issues with the guitar as far as strumming, disconnecting, missing notes or anything. Everything registers just fine (got the Xbox One version). Game mode on my TV is turned on, haven't touched any calibration settings. One thing I thought would bother me is the "not actually playing the notes" part, but really when I make a mistake I feel it, so that feedback is more than enough for me. Quite surprised to be honest.
When I got to that Skrillex song during the campaign, I had serious DJ Hero flashbacks LOL.
Very happy, if you can't tell. Just a fun fun game. Having a ball.