IGN score, off course it doesn't mean everything but my initial thoughts are backupped by these scores:
7.5 Presentation
Everything is totally adorable. LEGO musicians and cute cutscenes. The menus are slow though and the load screens are long and frequent.
5.0 Graphics
The game looks pretty bad, even for a Wii title. The text is hard to read, the models are jaggy. No excuse when there's a pretty good RB2 engine for the Wii.
7.0 Sound
A 45 song setlist is really weak in this day and age. The songs are such a mixed bag that it's hard to get into, though there are some great ones in there.
7.5 Gameplay
It's Rock Band, which is great. But where's the multiplayer, or any of the extra features that were in previous titles?
4.0 Lasting Appeal
No music store, no DLC support, and no exportable songs for this version. What a ripoff.
5.5
Mediocre OVERALL
(out of 10 / not an average)