Sadly the designed effectiveness of military camouflage is often* not gained at airsoft engagement distances, it is my understand that it is more important to block features of your human profile that the brain can identify subconsciously.
That said, we each play airsoft "our way", and what anyone chooses to wear is completely irrelevant. I chose to wear camo because I found that the imitation military clothing manufactures made camo with more availability than solid colours - black, green, tan, grey etc.
Thus, I bought imitation camo because it was cheaper than solid colours - at least in clothing designed for use with military firearms.
I chose AOR2 because it was not a UK pattern and it was not specific to a single unit/division of any armed service - unlike AOR1 oddly.
I also like the way that it looks.
Imo if you are wearing at least three environment appropriate colours (not black) from the typical ranges you don't even need camo.
*If certain sites are to be believed if you wear it correctly, it can work at airsoft engagement distances.