I hate it when I get to work (45 min ride) and remove my non mesh pants on a 80-95 degree day and my work pants (cargo pants or BDU style pants) are soaked with sweat and stuck to me. I'm going to get a pair of Olympia Airglide 3 mesh pants for this. I ride a 08+ KLR and a 03 Strom, both with touring windscreens that allow relatively calm air around the torso/head. The legs from knee down are pretty much exposed to the prevailing winds of the ride.
I feel the mesh pants in this instance, with full fairing bikes, is really the "hot" ticket
Around here in Pittsburgh, and after reading the conversations (arguments?) and the links provided... and knowing that upper 90's is not the normal summer temps, I'm assuming that it can be agreed that based upon my style of machines and geographic location with the associated temperatures that mesh would be highly recomended.
To us, 95-100 degrees is like end of the world, cars breaking down, folks dieing while cutting grass kind of heat.