What if I cast Scatter on the Archers? And what if I cast some weak Chaos spell on the archers? They'll all die immediately because they have very little health.

First of all, be more polite in your expressions – Sylvan archers are masculine, not feminine (this could lead to a decrease in your reputation)... Secondly, think about what Laxty said. And vampires aren't unbeatable either. At least, when playing against me, vampires don't manage to do much (except die)... but in general, they are very strong creatures... I don't argue! Besides, there's such a powerful spell as Divine Retribution. And one more small drawback: in the game, they become enemy #1 or #2, so everyone gangs up on them... hasty conclusions shouldn't be made either!
I gave a harsh answer, sorry... it just bothered me. I would gladly play with you and try to prove something, but I don't have that opportunity!