Tbh mass evocators are not that scary for me as a hedonites Player :p. Community around is quite competetive.
Iam talking about manovering around an almost immortal death ball for an entire game, not about tactical screening, blocking and counter charge. And for me this two are completly two diffrent things.
Ecocators are tought but you can kill them. And they become weaker after you kill few of them.
And if You are using damage 2 wepon its easier to kill 15 unbuffed evocators then Gotrek.
As Gotrek plot armour and abilities gives him 48 effective wounds vs Damage 2... And 72 wounds vs Damage 3
Not taking The base size for calculation when its much easier to surround them. And the fact that evocators loose attack power after you start wounding them and Gotrek does not.
If You Play badly and run forward i will be able to screen and kill evocators. But vs Gotrek I will have to split my force and dance for 5 rounds and this is much much harder.