ACUs definitely don't blend in to anything except specific rock piles. They don't blend in woods, not in deserts and not even in most actual urban environments, especially in the predominantly tan urban areas of Iraq. The velcro sucks and pin on badges were never a good idea. It even sucks wearing your badges with a seatbelt or normal assault pack. Berets are a pain in the ass.
They also stain really bad. This can be a good thing in the field, as they turn a little yellow/tan and start to blend in better, but it's a horrible thing in garrison.
The seems like to rip when you get sweaty and they stick to your legs. I knew I heard a rip one night, but didn't realize how bad it was until I took a knee and felt a breeze. I was kind of glad at that point that they made us wear the crotch flap on the front of our armor.
The shirt that was asked about from the pic with the xbox controller is an ACS (Army Combat Shirt). They've started working them in for underarmor wear. They're a lifesaver in the hot climates. The ACU holds in a lot of heat in the summer, but doesn't seem to hold in anything in the winter. It's even worse under all that kevlar. The ACS is way more comfortable and at least a little cooler. The armor rides better on it. They don't hold up very long though, and rip easily, and they still make you put another top on if you take your armor off, which is classic Army retarded. Even though mine were almost shredded I've kept them.
As far as I know the IR resistance is a chemical treatment on the ACUs as well. This means that any print pattern should be able to have it applied, and a pattern that might actually hide our troops and give them some measure of surprise or concealment could easily be workable. The army's main concern when adopting a jack of all off pattern was all the other gear that they have in camo print. They didn't want to have to field woodland and desert equipment for everyone. This was really stupid penny pinching when they're wasting so much money on bogus toys that either don't work or aren't used. Get us good gear and reliable AC and things will be a lot brighter for our troops!
It's always nice to see the Marines blend into the stuff they stand next to. Their camo works well in most intended environments. Adopting their patterns might be a shunt to the army's pride, but would work out a lot better. The Multi-cam looks like it would be quite effective too. I hear it works really well in most areas of Afghanistan. I only wish we had stuff that good now. It seems that the brass, in their usual wisdom, adopted the ACUs partly to save money as stated, and partly to look good for pictures on the parade ground. I've heard comparisons drawn between German WW2 uniforms and the allied ones about their functionality vs. presentability.
It reminds me of the first time I saw the gray uniforms: I asked, "What are we, Prussian?"