Cheese is high in cholesterol, so you have to take it in moderation.
Anyway, I think it is brutally unfair for monsters that have to fight any high level triple class players. It is down right mean because you give them no chance. Spell sequencers, whirlwinds, stoneskins and cleric beef-ups are just too much for anyone, even the baddies...
It might be fairer if you solo to fight the other Bhaalspawns (no doubt harder as well).
Sorcery and Shadow together as one, the arcane and the dark united. Through our knowledge and skill none can stand against us. We are as one, infallible and invincible. The Shadow Mages.