Please provide more details about the "cries" – how does a terrifying roar help against Berserk and Subjugate?
We scare the Berserked units; they run towards the enemy and attack them. We scare the Subjugated units and wait for the spell to wear off.
And I disagree with the statement that Necropolis rushers are not effective – only Kaspar can be considered a rusher, and even that's a stretch.
It's very difficult for me to comment on this statement (due to its unfounded nature). Let KillAndAction, who is more experienced, explain it more clearly and authoritatively.