Interrupts, and to a lesser extent, mezzes and stuns, should not be able to be resisted by equal-level targets, but they can be. Several encounters in the game require (or at least are made much easier by) consistent interrupts, like Operator IX (Regulators), Styrak NiM (especially), Minefield, and Gate Commander Draxus. On Styrak, a single resisted stun, slow, root, knockback, or interrupt can easily wipe the raid. Sage and commando healers can't reliably mez trash, either.
Either tie an accuracy boost into a talent high in the heal and tank trees, or give these abilities the same treatment taunt was given.