I honestly don't know why I have so much success with this build. On paper, the thing is monstrously hot and the leg armor is rather flimsy. However, in-game the heat is managed by firing the 6 MPLas at medium range before swapping to SPLas up-close, using the MPLas as a finisher. The SPLas have also proven very effective at keeping light mechs at bay. I've been averaging 4-5 kills a game, and pretty decent damage scores.
36 pinpoint damage for 18 heat at close range + 48 pinpoint damage for 36 heat at medium range + 24 DHS? I doubt there is any IS mech can match that. 9.1 points of sustained DPS with infinite ammo? In comparison, one of the best IS assaults: STK-4N has 54 alpha 20 DHS, is 9 kph slower, and has only 5.9 sustained DPS. Stalker has to relay on range and hillhumping. Up close, it is no match for the "underpowered" Executioner.