While I like the shouts and use them frequently, I think it would be great to add the ammunition system to them just as warriors received during last tuesdays balance patch. I feel the cooldowns are a bit too long w/o it. Also sic'em and strength of the pack are imo important for damage whether it be in pvp or pve.
From the latest 'balance' patch for warrior:
"On My Mark!": The cooldown of this skill has been synchronized between game modes and will now use the lower 25-second ammunition recharge time in all game modes. Reveal duration has been increased from 4 seconds to 6 seconds.
"For Great Justice!": This skill now uses ammunition, with 5 seconds between activations and a 25-second ammunition recharge time.
"Shake It Off!": This skill now uses ammunition, with 5 seconds between activations and a 25-second ammunition recharge time. This skill has been split between game modes and will now use a 50-second cooldown in PvP and WvW while cleansing 6 conditions.
All of these shout skills were lowered to less than rangers average 30-35 sec shout cooldown as well as getting the ammo system.