Some textures are compressed because their resolution is too high. But there won't be any difference between the custom texture and the original one if I downscale it, that's why you've got black pixels on your walls
(I lost the texture that makes that problem honnestly, but I'll try to fix that soon)
Now for your first pic, I'd like to remember you that I don't control everything on Black Ops 2, but a patch should be coming soon for fixing this piece of sheep 
( I won't explain here how it works, but look at the dirt next to that thing, you've just got to imagine that the lighter dirt was supposed to be over that freaking dark mud
only