Anyone else think the spell casters' spells are useless?

The only thing that really annoys me about spellcasters is if you have a 5 times over virtuoso with all the perks, you still get bad potions even though one of the perks say "Practical Spells and Potions always succeed when Sim is in a Normal Spellcaster Charge range". They definitely don't. Especially when I give a potion to another sim. Seems like a third of them are always bad.