Good game. Pretty much like the first one but with more features. Good party game, worth buying. Just plain old fun!
Game has a better online play. A bunch of new songs that players would know, so when it comes to singing you least know some of the words to all these new songs.
And if you played the previous rock band game, or the guitar hero games, you have no trouble picking this up and rocking. The game looks sharper than the first one, and sounds better too.
But the game is more of a party game, by your self can get a little boring, but they tried to make the single player more interesting.
I have not tried the new instruments because i had the previous rock band gear, which is another good thing. they have the new gear out there but you don't have to buy it as long as you have rock band 1 stuff.
I rate it a 10 because the game is all around awesome, so far i have not been disappointing by it yet.
oh and another feature that was a really good idea was bringing the songs from the first rock band into rock band 2. good thinking Harmonix.