the main factor is that unless faced with big guns, most sane people would be
1. in armour
2. behind cover
(if facing really big guns i would be in a different subsector)
in a recent games, one of my players when faced with the possibility of three barracades ran to the furthest, in line of sight of three guns waiting in ambush. the character was down long before she made cover.
combat should be lethal, for all the pcs and npcs. players will therefore think twice before pulling a gun, looking for cover and to work well as a team. i am looking into a way of translating the damage into T2300 rules (ie headshot, dead), to make it extra lethal.