Imho it will work if it will give a 100% chance of dodge against first missile fired at you in one turn (only when moving), OR if it will give a 100% dodge chance against all missiles in one turn, but only if you were strafing against them, OR if it will give a 30% dodge chance + chance of Hellrunner (50% summary) on any command. First two options both will make player to avoid big groups of monsters, so he will try to fight one at a time. But against groups of monsters it will be not so useful. Third option will just give dodge boost, which, i think, is good (especially with prerequisite of Hellrunner*2).
Autododge on every command - is nono definitely. Imagine situation when you are facing Cybie, you have pistol, and you kill him without problems because he is firing one missile per turn, he will never hit you, and you can fire and dance and do anything around him as long as you want.
It is a really worthy trait even in the way that i suggested, and it worth picking even for non-shotgun players (chaingun players maybe won't pick it because of prerequisite, but for melee it can change all the way they are allocating traits).