Whelp, I gave up and purchased it on PS3. I actually quite love the game thus far. It's just what I had hoped and I'm glad to finally be able to just sit back and enjoy it.
The PS3 version runs very well on my system. I'm using a faster hard drive, so perhaps that helps, but texture pop-in seems much less significant. More importantly, the problems seem to occur most frequently in the Wasteland hub. Every other area I've visited seems so much better in that regard. Even still, once you start playing, it's pretty easy to ignore. What I'm seeing on my system is definitely faster than some of the vids floating around. I'm not using an SSD, but textures appear nearly as fast as those videos above in most cases.
Is there any way to get a refund on a Steam game? It is perhaps the first time I feel compelled to return the PC version of a game. I just don't want it anymore. That piece of shit wasted an hour of my time yesterday and I'm still not seeing good results. It is the first PC game in ages that I haven't been able to get up and running at a perfect 60 fps. Some games require a little tweaking, but the end results are great. I'm sure Rage will eventually be patched, but the issues I'm seeing now make it seem as if they will not easily disappear. Stuttering? Hitching? Performance issues while textures load? I'm not willing to wait for those fixes.