Okay, so I've been busy playing Rock Band 2 lately.

What do I think of RB2 in one word? Awesome

Now for some details...

Characters
RB2 does not import your RB1 characters that you have created, which I think is kind of lame, if you can import the music why can't you import the characters? Especially since there isn't a whole lot of difference in the customization of them. Not that I want all my money and items that I’ve unlocked but the name/hometown and all that start up stuff, it’s all the same why not import them? Aside from that I love the new feature that a character isn't tied to a specific instrument now I can play the drums sing or strum it up without having to re-create myself! Big plus!

Tour Mode
I love that the tour is no longer locked down to multiplayer. You can create a band of one person and still play a tour, and have your friends jump in whenever they are around. Big bonus again! The downside to this is: they removed the single player straight thru the track list mode, which made it easy to unlock every song and know when you've unlocked it all. I still keep randomly unlocking songs in RB2 and I have no idea if I’m even close to the end!

Import RB1 Music
I haven’t done this yet, but it’s a great idea, and I plan to soon. I'm just sad that Enter Sandman won't make it across the journey.

Downloaded Music
All of my previously downloaded music shows up immediately, no work needed - that’s a great feature, good job on this one Harmonix!

New Songs
New songs are always a good thing, there's a ton in here, and I’d argue that on the whole the track list is much better in RB2 than it was in RB1.

I love the new things in RB2 although I wouldn't say it’s quite enough to justify the '2' they could have put a little more into it I think, it’s more of an expansion. The price is great if you think in terms of tracks to dollars. You are getting way more music that $60 would buy you in the music store.