I've been trying the claymore out in Guerrilla mode, but I'm not sure how it works. It blows up, but I'm not sure when. When I lay it, it shows a cone of vision or something, but I'm not sure what that does. I also haven't seen them blow up a vehicle. What determines when they blow up? Do vehicles activate them too?
I don't know about the vehicles, but these are anti-personal directional mines. The red cone indicates it's proximity sensor, and if someone gets caught in the direction of the cone the mine blows up inflicting small radius damage.
Anti-Directional mines are useful against most of the enemies, except Bodarks, since they're tougher. Two claymores are required to kill a Bodark, unless he stands too close to it or have taken damage before. I don't think it would have much effect on vehicles. LMGs and grenades + grenade launchers work best against vehicles, especially the LMG, since they penetrate one level of wall and has enough power to damage the vehicle properly