I don't run around with shotguns. Check my Hunter, I use a sniper. I melee when blinking so there are certain periods of time where I am a bit vulnerable. Not to mention that Blink is pretty easy to track when someone teleports. And besides that was an example. There are many ways I can take on multiple enemies. I can use cover, I can use grenades, I can use a super... many ways. None of this even matters because fusion rifles can still hit 1 shot kill from a far range, which is completely ridiculous.