I love loading the mini-mechs (Firemoth, Jenner, etc) with about 8 PPC's and setting them to the same chain fire group. . .
Sure, my mech would overheat, and power down for five minutes, and occasionally explode, but hey, when you can disintigrate a super heavy mech before they knew your were there, it all pans out.
This tactic is great for human vs. human games. Heh, the looks on their faces. . . heh. Just don't miss!