The spellmaking in oblivion was pretty great too, you could make multiple spells which applied weakness to magic and to specific elements in enemies, and since they were applied by different spells they would multiply each others' effects. Then you hit the enemy with a damaging spell and annihilate them.

I never saw it mentioned anywhere, but for me, hiring enemies with sufficiently powerful magic would ragdoll them, a bit like if you hit a corpse or a paralyzed enemy. So doing a 4-3-2-1 combo, 3 different spells that applied 100%weakness to magic and lightning, then hitting them with a lightning spell, would always send them flying. Sometimes it would be like they just vanished because the amount of damage applied by the spell threw them so forcefully.