Quote Originally Posted by Sacerdos View Post
If you do the simple math that 16% uptime on a 10% damage buff is only a 1.6% raid damage increase, you might be right.

You forget that its a 10% damage buff during the entire raid's opening burst (lined up with Battle Litany and everyone's openers), and lines up well with multiple burst cooldowns through out the entire fight (i.e. a BLM's second Raging Strikes/Convert burst at the 3 min mark). Its a much larger DPS increase than it looks like on paper.
Not to mention you can also coordinate it for burst phases, when others will be delaying cooldowns slightly because of fight mechanics and the like. It's definitely significant--if it weren't, NIN wouldn't be as popular as it is in the top echelon of progression groups.