Morale rules... egh. They suit general games but don't suit specific scenarios more often than not - in my games of SST with my local group, the game fell flat because of the way in which units reacted to losing squad leaders, especially more elite units like Marauders and Pathfinders, and restrictions on certain units' command radius.
I can just see squads of SAS in BF:Evo running around like headless chickens because their sergeant got hit by a stray bullet... or did they fix those rules?
Obviously the bugs aren't /as/ subject to morale problems as humans - hence their command structure, where lost individuals in a swarm make no odds. However, the Brain bugs are big, fat, smart bugs - they know when they're in trouble, when battles are being lost, and when to withdraw and regroup. Shattered is a good rule - in a playtest we did way back last year at an open day, it made a huge difference to a Skinny vs. MI game. The skinnies wiped out masses of MI with a Cabal and heavy/light raider, but because their soldiers were all hidden on turn one, killing one raider and a few cabal lost them the game.