He mentions "why do games not concentrate on environment and wall textures" when Uncharted and the developer, ND, are one of the few games that actually do.
But it it's a mix for Uncharted. some high-res textures, some med-res and lots of low-res. It's just harder to notice in a third person FPS. Like mass Effect where lots of textures look amazing in third person but once you get into first peson and look closer they are quite crappy.