Okay, then you take the basic Life skill, and you immediately get Exorcism, which is useful... so you don't have to spend levels to get a couple of magic skills – a simple hut for Basic will suffice, and then a magic library; anyway, combat and tactics are combat skills...
Dispel is always needed; if a mage casts Berserk on some mega-unit near a hero-barbarian, he's doomed, he won't stand a chance, no matter how much armor he has...
I disagree about Life; you might get Spiritual Armor or Blessing, and these two spells appear in the basic skills much more often than Exorcism. The same goes for Dispel.
And the chance of finding, for example, a shield with protection against magic from Haven or even a red cloak (30% magic protection for warriors) is probably higher than finding a spell; at least, you lose less.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!