Camo was designed for real warfare - where guns can shoot 300+ yards. Most engagements in paintball are inside 150'. That means that at those ranges your brain is WAY better at seeing movement and silhouette than at the longer ranges where color and pattern matter more.
I wear dark colors. As simple as that. Keep yourself from silhouetting against sunlight, stay to the shadows and dark solid colors are just as effective as camo.
Here's the real deal - scenario games are often long. Wear something comfortable. ghilli guy in 95 degrees is going to pass out. full cammo plus tac gear guy is going to dehydrate. Loose fitting breathable guy is going to be pretty comfortable.
Wear stuff you can run in all day and the benefits will far outweigh the slight advantage that camo gives you when laying face down in poison ivy.
Yes, also note that poison ivy is not an ideal ghillie material.
I have to agree with them even wearing bright colors you can disappear with ease depending on how you move in the enviroment your in. Some of the best where I play wear plain black and greans and blues, even one guy mix and matches his camo blue bdu pants and desert camo top and I bet you cant see him. Also remember people see what they want to see not whats really there.