MyeRs: I don't think scaling down the rock textures would look good. It would just look like a bumpy surface instead of a large rock wall, like most maps use them for. I tried to keep the scale pretty close to the originals. I don't really care if people scale them, but if we do a strict HR4 pack, then there will either be one set of textures that everybody can use, or just a few possible selections - you wouldn't be able to tweak textures (unless they became officially approved, or however we handle that).
Of course wwall1_1 could use more work, but I think it looks decent and true to the original (attached):
What, specifically, do you think needs work?
T3RR0R15T: I didn't reply earlier, but I made some changes to the metal2_8 and 2_8 to make them brighter. Any brighter than that, and it looks bad, I think. Your second one looks too greyscale. I'd like to have a little more color. See what you think of the new ones.
The _metal1 textures could stand to be redone, but I'm going to try to finish up the other textures before I get to them.