(which considering aggro is based on DPS for the most part, is nearly useless).
It's not entirely useless as Hunters can generate more damage when they have aggro and easier time countering/setting up certain attacks, which makes boosting your aggro generation at the beginning worth it. It's just that at 3SP and 14 seconds duration it's not 100% effective, on top of other Hunters using war cry too and Gunners using Showtime. It also does one more important thing, that's resetting aggro table for enemies pinged with it, so you don't need to worry about arriving late to a boss.
Jellen to enemies affected by War Cry (AKA enemies deal 10% less damage).
Actually it's more like 5% due to certain way enemy attack is calculated. War Attract also makes losing aggro much harder to the point other players can't gain aggro by DPSing, and instead have to first use some aggro reset skills like another War Cry or Victory Shout. It's also useful in conjunction with one Phrase augment that's not available on NA right now, which makes you deal 5% more damage to enemies affected by jellen and is best in slot for Hunter pretty much.