I dunno... I'm currently a 24 ranger, and I've found that soloing mobs was faster and easier with Blade Flurry up. Keep in mind, I'm talking about blue down^ mobs... Open with a couple ranged attacks, Cheap Shot - Stalk - Shadow Lunge - Shrouding attack (can't remember the name offhand
) - Shadowflame... If they're not dead then, they will be after a Pierce. Without Blade Flurry up, I actually end up having to face a hit! :0