I thought the pattern worked pretty well in the desert. The main gripe was the inconvenience of pockets covered up by the tac vest and plate carriers, but that was rectified for many of those who leave the wire by having pockets sewn on the arms. Now of course, no matter what pattern you wear you'll never blend into everything, so nothing will ever be "perfect"
I'd like to hear from the guys on the current roto, though, who are out and about in the boonies. They'll probably have the best viewpoint.
As for the uniform reflecting too much ambient light, well... If you're by the dark sand, ok.. but through a lot of the terrain the sand reflects just as much light and that comment makes little sense. So take your pick: Stick out in the darker areas, or stick out in the lighter areas. Do you really want to hump 2 different uniforms and change them every half hour, just to blend in better with whatever particular feature you happen to be walking by?
What about the nice green tac vest and nice green patrol pack? Those stick out sometimes in Afgh, and sometimes not, depending on where you are. Heck, even the season makes a difference. Summer is greener than winter.