I think AOR2 suffers (not as badly, but still does suffer) from the same problem that British DPM suffers from, in that it is a bit too dark to be effective at long distances in typical UK woodland terrain, when colours fade owing to atmospheric pressure. I think Multicam is better in that respect, so that's why I use a Multicam USMC set in woodlands and a black SWAT load out for indoor CQB. But then again, I'm one of those players who tends to crawl around and roll about rather than simply crouching, which means I end up covered in sh*t, but at least it is sh*t which matches the background lol.
However, that's only my opinion and if you like AOR2 and find it effective in the terrain you are playing in, at the sites you regularly attend, then fair enough.