Frankly, I've had teams with over 50% snipers that still failed. But yes, Huntsman sniper is by far the best way to go; Just don't stand to close to Merasmus, as it reduces friendly fire (I've headshotted like 3-4 people in my attempts simply because they were unlucky enough to run past me as I fired my arrow). Also, don't be a jerk and run arround killing people while Merasmus is out; One jerk can basically cost people the match, especially if said jerk hits someone who was carrying the bomb.