The graphics are mind blowing. However individual textures vary from detailed to Doom 1 quality (seriously!). I'm not sure if it's a bug, something tells me it was something they did to make the game playable on consoles.
If it is a bug, I hope it gets patched soon. If not perhaps Id will release a texture patch to bring the games textures up to what a PC can do. If not, I'm sure we'll see a 'high end textures mod' before too long.