Oh yeah, regarding reviews for Theatrhythm Final Fantasy, 1Up gave the game a B.

edit: here's the link http://www.1up.com/reviews/theatrhythm-final-fantasy-review-addiction

I found two more reviews for the game. 90% from this http://wegotthiscovered.com/Game-review/theatrhythm-final-fantasy-review/
and 4.5/5 stars from this http://blastmagazine.com/the-magazine/gaming/reviews/ds/3ds-ds/theatrythm-final-fantasy-review-a-musically-stimulating-anthology/
Both scores are placed pretty much at the top part if you're looking for it (rather than at the end of the written review).

All reviews have been quite positive so far. That's good.

I know a lot of folks find that artstyle adorable.

I find it creepy. It turns all the characters into soulless dolls, staring unblinkingly into the very core of your soul...

*shudder*

Played the demo, now I need this game, and for £22, why not?

How much will the DLC be, out of interest?

Wow! IGN gave this game an Editors Choice? That's.... good, but shocking!

Two more reviews are in.
8/10 http://www.bordersdown.net/content.php/422-Theatrhythm-Final-Fantasy-Review-Nintendo-3DS
and 5/5 perfect score! http://www.dailyjoypad.co.uk/?p=38429

edit: I just realized that the first link was posted around when the Japanese version released and was a review of the Japanese one so this one may have been  floating around for a while now.

Added all those reviews in the op, thanks MDM!

hahaha I'm probably one of the most excited people for this game. :)  I am more excited for this game than KH3D and about just as much as Luigi's Mansion.

And..... my copy has shipped from Amazon. Should be here right in time on Tuesday!