How Would You Define 'Distrupted' ?

[ShipwreckedFool]

I wonder what some of you guys with more experience think about how the DDR rule affects balance? It sounds like it would add a lot to the game, but it seems that 95+% of scenarios are not designed with it in mind, and that it would swing the balance unfairly towards the defender. I feel like explicit supply has a similar problem, that it's difficult to tell if a scenario is actually properly balanced with the given rule in play.