It's just the easiest build to play, period. I roll a quick repeater and tachmag SMG with Overcharge and do fine. I'm certainly not leet by any means but I usually go to 2:1 KDR in shadow wars with over twenty kills.
Yeah, sometimes I just die out of nowhere but then I think about all of the players I've one-shotted from beyond view range and it all works out.
Rear Guard perk (plus all the survivability perks) and a Rhino/Ironclad shield will counter that easily.
Radiation or Bio resistance on your shield helps the best. People just run with those 2 elements on their weapons.
Maybe I'm doing it wrong, but I have never seen any shotgun one-hit kill someone. Mind you that is at ego 5k+. It could be a scaling issue at lower levels. Zaggers certainly won't one-hit kill someone when they are scaled 5k+. Also, only issue with that weapon is the pumped up perk and epic bonus. The shotgun just needs a different epic bonus, and then a 10-15 second cooldown on pumped up. If they don't do that, people will just repeat the cycle with one shot rocket launchers or something else.
Platform: PC | Server: NA | Clan: none
Toons: Aellura (EGO 5551) | Zhedda (EGO 600+)
dyunan.natsuu デュナン・ナッツ - PC NA