Allow me to clarify: When I say a flat "+0" I mean no plusses or minuses to my targeting roll. If I roll a "+3" on my dice, do I add that to my Discipline of "4" for a total of +7? Or is the actual strength of the attack what matters and the targeting roll is moot? If it's the latter, then Wards are mighty effective. If the former, then Wards aren't all that hot.
That said, as a GM, I prefer the latter interpretation. But I wanted to do it the right way.