I think it will be still shit weapon
No. From what have been said, I guess it will be at current avenger level (in term of damage).But I don't think it will be as rare as gauss pistol.
If you want to make enemies, try to change something.
It'll be ~2.5 what it is now.
Armour stats are elsewhere. You will want to be in metal when one of these is about
MKI, MKII or Tesla. I explained the design idea behind the armours elsewhere too.
If only armors will be changed and metal/tesla/combat armors won't defend so much against laser. Or if it'll deal the same damage as avenger to metal+ armors with current DR/DT, then they will need to increase laser defence to muties and most of creatures, or else you'll kill 3-4 mobs per burst in TB with gatling.