Ugly? There we are, TLoU, already a gorgeous game, improved in virtually every way especially in framerate whcih could drag a bit on PS3, becomes ugly at the drop of a hat! There's only one difference between 30 and 60 fps and that's shadow resolution. One shouldn't define the aesthetic of a game purely on the shadows.just a random thought but, does it really have to go from pretty to ugly, 30 to 60?
As for ND creating a nice mid-way point, they almost certainly can, but this is a port, not a new game. It was a 60 fps target and that's what they're releasing. They just decided on whim to give a 30 fps option, and found that with minimal effort they could throw in some higher quality shadows. The end product though is the 60 fps version. That was their target and what they tweaked rendering and resources for.