Most of the hunting camo patterns I see around my area (Cabellas, Bass Pro) have alot of deep green, dark brown, and tan leafy looking stuff that doesn't mimic the locality. In my area the terrain varies in color, yellowish rock, greyish rock, lots of greyish bark, some greenery, some red, lots brown leaves and lots of light brown/amber colored foliage and it can vary greatly within a short distance.
Most areas here a MARPAT Green or Desert would do well, but the grey rocky areas with lighter folaige I think a ACU ( I find it a greyish green with a hint if straw mixed in
) color or a Digital Urban would be better, but we have to wear orange hats and vests here for big game, so I am not sure how effective camo is when your covering half of it.
I am sure camo assists in getting game, but shot placement, knowing the terrain, prey tendencies, (SA) knowing what is going on around you, patience and your positioning 'probably' play a bigger role in getting a kill.
My .02