personally, I think a body kit should have lines that flow well with the rest of the car. To make the car look like one whole thing, not one thing w/ a big skirt stapled around the bottom.
While the work appears to be well executed, the styling just doesn't flow. The lines just don't go together at all. It doesn't matter how good the install is if the shape and flow of what you are putting on the car doesn't match the car.
Cliff Notes: It looks like it was done well, but overall the look just doesn't flow together well.