No.
The only reason I can think for them to kill a skeleton army faster than other monsters is because they can often focus their attacks on a single skelly more efficiently than melee monsters.
They tend to come in small packs, and aim their ranged attack at the same target(whomever is closest). Melee monsters on the other hand will spread their damage out between multiple skellys, and give each one plenty of time to regen(the high regen rate is what really keeps skellys alive).
EDIT: Just to mention though, once you have a decent lvl of mastery/raise, those mauler types will not be killing skellys any time soon. Even in NM/hell. They aren't really a problem for skelemancers usually.
The only reason I can think for them to kill a skeleton army faster than other monsters is because they can often focus their attacks on a single skelly more efficiently than melee monsters.
They tend to come in small packs, and aim their ranged attack at the same target(whomever is closest). Melee monsters on the other hand will spread their damage out between multiple skellys, and give each one plenty of time to regen(the high regen rate is what really keeps skellys alive).
EDIT: Just to mention though, once you have a decent lvl of mastery/raise, those mauler types will not be killing skellys any time soon. Even in NM/hell. They aren't really a problem for skelemancers usually.