Great game, great music and great online
Graphics in this game could've been better. The vocalist looks flat out ugly. The drummer is very stiff in terms of animation. The guitarists don't even touch the guitar when they strum sometimes. All in all, a bad job in the graphics department. Although sometimes, there will be some parts wherein the game looks really good but that doesn't happen too often. Either way, the graphics really don't matter in a rhythm game so I wouldn't worry too much about it.
Sound is obviously the best part of the game. The songs are great! I like it better than the songs in Guitar Hero II. The sound effects are great, although the sound when you hit the wrong note does get annoying after a while but it's alright. It's not that big of a problem. The sound also comes out of the Wii remote so it really makes you feel like you're playing a real guitar. That neat little feature is Wii exclusive
For $90, it's worth it. The only problem is the Wii version doesn't have Downloadable Content. Though not to worry, RedOctane have stated that it will come early 2008. Still, $90 is pretty big so I suggest you watch some videos of the game first or try it at a friends house if they have it and se if you like it. It's got a lot of replayability with online so if you're a fan of rhythm games, it's worth it.
All in all, I love the game. It's addictive, it's fun, it's great multiplayer, it's got good online and it's got good music. I will be playing this game for a long time. The Guitar Hero series is definitely one of the best console rhythm games and Guitar Hero III is a fantastic sequel.