We don't need it.
1) You need to play the game to actually see the difference. One screenshot doesn't prove anything
2) Independent game experts and reviews have always said good things about the game technology if even they don't like other aspects
3) Carmack is involved with the game engine and not the artwork. So blaming him is just stupid
I could go on but this is enough for now.
I honestly can't wait for the Linux port of Rage!
All the best to Tim and his future in (Linux) game development.
In theory ut3 and rage are supported via wine. the difference however is that ut3 is awfully slow due to the conversation from d3d to opengl. for rage the 3d rendering is 1:1 mapped and therefore MUCH faster. opengl games via wine vs native is no huge speed diff and you even gain the feature to press alt+tab which is often not possible with pure sdl ports. so you can play it, dont worry. It would be much worse when id software would produce d3d only games.
I'm all for native over wine. Wine to me defeats some of the purpose of using Linux.