Obviously there isnt, and he isnt exagerating, klingons melee weapons can stun lock, and science officers can stun lock, and if you expose someone you CAN 1 hit them with an expose attack.
not from full health, from around half health(shields gone or almost gone), but thats not one-shotting.
i've seen some crazy crits on exploit attacks that took people from full to 25% hp, but those were rare.
i've been controlled and killed from full to empty, but those are the exception to the rule. We are people blasting each other with massive laser cannons, so i expected to get vaporized every now and then.
I've done ground pvp for hours on end, but don't seem to be running into the same issues as the OP on a regular enough basis to mind at all.