That... seems kind of low to me. seeing 1k-1.5k guillotines and rampages seemed pretty normal/standard to me back then.
it wasn't that common, level correction ruined a lot of damage. you could get those numbers on EM (so no correction) and lower more easily, though, with some buffs like LR up. this particular mob here also took extra damage from slashing if I recall right.
For example, this Guillotine set on an average generated EM, but I forced capping attack and accuracy only gets an average 932 damage. Even this might be an overestimate, I don't remember what the mods were at 75 but I used 30% STR and 50% MND here, I could go back and look at really old versions on wiki, though.
ItemSet 391671
Edit: Changing to 25%/25% from 2008 wiki info gives a slightly different set that will average 907 damage.
Asuran was the best WS in situations like that and could reach those numbers more easily.