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So, wizards... Is one hero not enough?;) Alright, I'll share my opinion.
Mistresses and Queens: They are the first to take positions on the battlefield – they shoot. That's why I don't use their magic much. Queens are a different story; they don't have bows and arrows, and their speed and initiative don't allow them to be used as an attacking force (and their damage doesn't quite match that of Paladins and similar units...). Still, I don't really like Light and the lower tiers of Darkness... But they have enough mana, and before they get reached, there will be plenty to keep them busy. :)
Adept: Ooo... Their magic is quite something... Punishing Strike and Strength are not really useful, but Blind is my weapon of choice. :) For some reason, my Dark Magic knight keeps getting debuffs and rays, while my Light knight gets a full set of spells. :) And sieging a Castle with Adepts is a pleasure. Unless, of course, it's an Elven Castle. ;)
Lords: It's fun to bombard the enemy with Fireballs in a pattern: Fireball - Gate - another Fireball - Phantom - again Fireball - summon Archdevils - again Fireball. :) ...Although they are also good in melee combat.
Dryads: They are only used to harass neutral creatures. :) By the end, I usually choose Nymphs.
That's all. I don't use the magic of other creatures, or I use it infrequently. I'll be happy to hear your comments. If, of course, anyone has the patience to read this. ;)