the sad fact is that consoles can write to texture memory directly and don't need much detail, so the engine works in that environment.
where tech 5 fails is on the PC, where you cannot write your texture data directly to the hardware and PC resolutions are higher, so the lack of detail is more troublesome. carmack is adding another dithering routine, but the engine is just not suited to take advantage of the PC, unlike some other engines which produce much better visuals at a lower cost
rage does a good job of adding corridors to an outdoor environment, but can you imagine if something like this were to be used for Skyrim or ArmA or GTA? it would be a disaster