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Destruction magic may be the coolest among the Elementals, but it becomes less decisive when you have large armies.
Well, it depends... By maxing out Elemental Fury, equipping the "Rune Power" set, emerald boots, the Ice Embrace amulet, and the Phoenix Feather cloak, and using an Elemental Chain on a lucky Wizard, you can deal insane damage, five times the base amount. There were times when I could obliterate a stack of a hundred Titans with a single lightning bolt using such a setup.
However, it doesn't work well against mages with their damn Magic Mirror; in that case, you have to cast spells that deal area-of-effect damage, which means sacrificing "Earth Shock" and "Freezing Wind."