I have two characters currently. A pure mage, and a hybrid.
In both cases in any PVP fight or even PVE, my characters are heal bots. Which means it is the most boring and least fun play style in the game.
I am sure some person enjoys just casting lesser heal, purify and magic reflect. Because anything more like greater heal takes to long and sucks more mana then it is worth. And any offensive spell will just be reflected back at you, or is completely useless.