1st: The chassis itself is easily the most favorable for this tactic, as it has good arm reach and the MG's are on the arms. This allows you to essentially always have your guns on the target even if your angle of aproach is off or you'r in a high speed circle - further, it prevents you from having to look dead ahead at the enemy and give them easier CT shots.
On top of this, it's perfectly viable to run with a standard engine, meaning your mech can lose 5 sections before being wiped out, as opposed to a maximum of 3 sections with an XL engine which on a light mech that also has hit detection issues, is an incredibly strong situation. The standard engine spider seems about as tanky as a medium or heavy when you get into a decent groove.
In my opinion, these two points are the primary reason you see people clamoring about 'MG spiders' and not 'MG cicadas' or 'MG Jaegers'
2nd: The MGs themselves are incredibly easy to use, simply spray and pray. The spread ensures even fairly off target shots are going to have a chance at that CT destroying crit, poor target lead is less of an issue, and holding fire on the target is less of a waste of ammunition if you don't have a clear shot.
This is a big factor becuase it really only takes a few lucky crits to completely destroy even a massive mech. I cut through a few heavies/assaults rear armor with my medium laser to see their insides go from yellow to black in 2 seconds. I'm not complaining about time to kill here - the survival time in a head on spider fight is actually greater than most mechs - but the 4/6 MG combo is absolutely lethal in the most frustrating of ways; random chance.
In light of this, I have a few suggestions;
1. Set a maximum number of damage a section can take from 'critical damage overflow' when you damage a component. This should probably be no higher than 75% of inner structure max health, to ensure that a few simple dice rolls don't completely explode a mech if a 4/6 MG mech rolls up and gets lucky. AKA; There should be an actual opportunity for fire exchange in all situations, and while this situation isn't common it isn't super rare either based on what I've seen, meaning people are getting instagibbed by lucky MG streaks with some frequency.
2. Significantly reduce cone of fire on MG. This makes aiming far more important. My current strategy is simply waving my arms wildly over the enemy when I pass in front of an exposed section, it takes no effort and is highly rewarding with either a destroyed component or a kill. If I'm going to benefit from a mech's CT self destructing, I should at least have to aim for it.
Edited by Monky, 18 August 2013 - 11:05 PM.