A fun game, but as with the rest of them, it gets really boring really fast.
And for the most part, the game in general is pretty good. The career mode starts off with some really slow, boring classic rock songs, which is understandable. You definitely don't want to start off with an insanely hard song, but having said that, the song list is pretty weak and, strangely enough, lacking good rock songs. This song list, ironically, seems to have less hard rock songs then previous Guitar Hero games, despite having "Rock" in the title.
Also, the career song list itself is pretty short, and can easily be beaten in less then three hours, depending on your skill level. The only really difficult songs in the career set list is "Raining Blood" by Slayer, and the end boss fight ("Devil Goes Down to Georgia")
But the place where GH3 really shines is, of course, the multiplayer. Whether your playing online or just sitting next to a buddy playing, its fun. There are a few different modes, including boss battles. Multiplayer boss battles play out just like the single player ones, including the attacks. Although this is entertaining for a while, there is really no reason to stay around and play this game for long periods of time. Once you have played any of the songs more than 10 times, it quickly becomes old and you wont want to play it anymore.
All in all, while GH3 is a fun game, I find myself wondering if it is really worth the full sale price ($89.00), and if I will ever play it again after putting it away.