Having played with the G5 Executioner myself, could someone explain why it seems to be one of the most popular weapons? I find it slow (handling, rate of fire and reloading), cumbersome and anything but comfortable when compared to something like the Tormentor or a glitched out tunnel bore Intimidator.
Stealth cleaning bases from Scavs is the main use for me. It does require some targeting / leading skills
However, it can be used as an assault rifle (it can 2-shot anyone that has shields up or one-shot shieldless enemies) - but it requires a different mod set (hip fire accuracy being almost mandatory)
When things go crazy, i usually swap the Exec for Tormentor - however, versus top ranked npc it's no longer a 2-shot killer weapon. Still, it's powerful enough and the firerate is fast enough. Also being a sidearm, Tormentor's handles very well and it does not have much of an encumber factor