I think its just the general shape of the surfaces in the grille area that don't work, for me. Surely there must be a grille out there, somewhere....
Biggest problem with this car (for me, anyways) is that a G37S / xS is roughly the same price, better balanced, big enough, and post facelift the G37 sedan is really nice looking whereas the TL is passable at best and requires extra money.