You are not playing the game right if you are dying in seconds after losing outer armour. Most people will have gotten the hell out of dodge unless they are doing a stupid blind charge. And PGI did state somewhere that the MG is suppose to be a weapon that takes advantage of exposed internals. It is suppose to either crit systems inside or even take out the internal itself.
My medium laser does all the outer armour damage anyways. I only engaged targets previously hit so they are already red. With timing and a fast mech you can do a run by with a single med laser, help a lock on, and then proceed to try and chew away with MG's if not you run.
His point was, or if i'm misstating his let's just use it as my point, is that Crit-Seeking after armor is breached is inferior to simply doing more damage all the time. I will never, ever, mount a weapon just because it crits in this manner. With more damage output i get to strip armor faster and destroy the internal structure faster. I don't give a flip about possibly maybe having a better chance of randomly getting a crit kill on a guy's medium laser. Certain damage vs situational random bonus... i'll take option 1.