1. REAR ARMOR!!!! esp. when in BA or Hgauss Holly this is a treat.
2. Legs (first to go if allready damaged)
3. Weapon arms
when using light mechs i try to hit the wounded enemys, or deal damage here and there to heavier ones, only to quickly escape.
when using heavy gauss i pick off lights or wounded mediums/heavys for some one shot kill action.
when using longtom obviously groups of targets or assaults.
when in assault i usually pick off the ones that have full health, so my mates can chew them up easier.
when in tank/harasser with ACs or Mguns, flying and BA are primary tagerts.