this game is awesome! but like otehrs have said, Flaws exist, and tehre is room for improvement. I remember when they origincally talked about this game, they made mention that you could be the drummer in ohio and your guitar player could be in california with the singer being from south carolina, I don't see any sort of option to do something like this on xbox live.
I've only been doing the solo tour because I'm pretty confused about how to do the other world tour stuff. I played the world tour once with some friends, but most of them suck at guitar hero, but they still had fun (I was the only one who could successfully do the drums)
one of my biggest complaints is about the cheapass (not to insult the forum) bass drum pedal. I've been drumming for 12 years and I've learned how to use the rebound of the bass drum head (especially for those double and triple hits at the end of hard mode, and all throughout expert) I break streaks all the time because I miss them and it pisses me off! I've seen a few mods that people made to use an actual bass drum pedal from a drum set and a drum pad (GREAT idea... I just don't want to mod and most likely screw up my bass drum pedal)
I'm also having some issues with the red drum not capturing fast enough (if I try to do a 16th note phrase it rarely picks it all up) and I'm also having an issue with the guitar (tilt sensor doesn't work, which is ironic, because my guitar hero 3 guitar tilt sensor doesn't work either!!!)
the game is playable, but I'm contacting support today about getting replacements. as far as my GH3 guitar goes, I got it for free from yourfree360games.com so I have no receipt, not sure what to do about that.
there are flaws in this game, but I think the drums alone make this game worth it. and if you have a few "rock band" parties its a hell of a lot of fun (kicks the crap out of karoke)