After testing as a full support in WvW the numbers aren't good enough. Damage and CC is worse than with short bow in full minstrel and staff offers way better survivability than scepter with a shield. That shield's static blocking needs to go as you'll be just left dead for staying still and falling behind constant movement.
I'd say scepter needs longer range for the auto attack and faster windup for the barriers. 4 seconds is way too long for such weak effects. Or something like 1 condi cleanse every swing to make it worth it go close to action. Scrappers and Weavers are pulling double or triple the cleanses anyway.