I have a love/hate thing for this title.
I hate this is for PSP. As such, I will not be ordering these. I will be playing them of course, but I can't support such a lazy idea from NBGI. Not this time.
I do love how it's purely a rhythm game. It's a great way to get some more use of the iM@S library of songs we normally wouldn't be able to see in the main games. This isn't a mothership iM@S game, so there's no reason to act sour over the fact that you can't customize. I would take pre-rendered videos over terrible 3D models with un-synced lips any day.