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Everyone has their own preferences when it comes to religion :-)
But I like mages, or at least battlemages.
The only thing I don't like about mages is that they don't get logistics as often, and I really love logistics :-).
A well-leveled mage can easily defeat a strong warrior with superior forces (Mass Slow, Blindness, Berserk, Explosion, Meteor Shower) + their magic power is quite impressive compared to a warrior. BUT !!!
If the warrior has a Sphere of Inhibition or at least a Cloak of Resistance, then the advantages of magic are nullified, and the warrior simply crushes the mage.
It can be frustrating when you level up a mage, defeat everyone without any losses (Resurrection is great), attack a barbarian who ran up to your castle, thinking "I'm going to beat him up now," but he has a Sphere + Shackles + Tactics... and that's it :-)
So, magic is very good, but there are ways to counter it.
And let's not forget that a mage shouldn't fight on cursed ground.