They aren't low res textures. And a lot of the space is taken up by audio as well. 5.1, 6.1 and 7.1 sound is supported. If you have teh setups it becomes a much appreciated feature. It's INsomniac...the Raqtchet and Clank guys...they were never the leaders in pushing a system graphically. For a lauch title on a new system, I think it's a pretty good job.
GOW is nice, and looks great. They are two different types of games though. Is Gears prettier? Yes. Is it better? Well, hard to say since I haven't played Resistance at length yet. I admit that I am not into FPS's as much so I might wind up still liking Gears better. BUu I hardly think R: FOM is the reason I am buying a PS3.