Were ther skaven in live game?

[Telen]

Mythic took a massive dump on the lore with that one

[Aurandilaz]

The skaven quests for Warpforged body were damn annoying.
The only fun of them was the small rat engineer that could throw snare nets, allowing insane damage when a mass of people didn't realize they were taking damage from moving but still kept moving.
Aiming with the rat ogre to throw people to the walls was painful. Often people were just thrown INTO the wall, hitting the outer and falling back down on outer side.
Then the "magic caster" engi that would create insane magical damage by somehow building resources and then unleashing a huge warp energy blast.
There was maybe some support/healer rat, but that one was pretty useless.

Shitty thing was, having the "skaven mode" on meant you lost all buffs, all potions, all special pet bonuses and so on. No health pots to be used, no helpful career abilities... so it was always somewhat bad choice, unless you had two skaven magic dmg casters focusing fire to create insane AoE dmg bursts.