Hard to say... either too high or too low.
It's pretty hard to rate a game where 80% of the appeal is creation and the user community when neither of those are going to be developed when the game is being reviewed.
A game like this takes at least a month for you to get a real good feel for the editor and more like 3-4 months after release before you know how the community will ship out.
As such you are stuck either reviewing on what's their or reviewing on potential...
It's really a game you can't review. Or at least you can't on a console since you don't have any of it's brethern in the genre to compare too.
Things like library of stuff it comes with, how the menus work, number of triggers, scalability of the physics, how easy the editing can be etc will be tough to judge when you don't have any expierence with this kind of stuff.
I know if i was reviewing it i'd probably knock .5 of a point off for forcing sackboy to be the main character. Nothing against the little guy but i'm used to being able to make your own avatar comepletly right down to how everything effects him and how he looks.
