People seem to be missimg one thing, one shot build would not be so bad if the class using it would not have so many escapes,evades,denys,stealths and invul at the same time. Unlike mesmer,thief and soulbeast a guardian one shot build will leave you defenseless after the elite invul and block heall and dodges. All the other mentioned classes will stealth teleport without need of target and also deny damage through invulns. So if all would be as vulnerable unable to run away after burst like guard it would be fair.