All I gotta say is three words:
ROOT AND SHOOT
wanna know the purpose for this bow?? that's it!! cast root, and fire away....never worrying about breaking the root with a nuke or anything. This thing has better stats than some one-handed slash weapons in terms of speed to damage ratio. so i ask you...why stand there and take a beating while swinging wildly with a pair of yaks, when you can shoot faster than you can swing, AND have the possibility of getting crits, double/triple attacks with the bow, AND for some higher lvl rangers the trueshot discipline.
True enough, you NEVER want to use some class 6 steel silver tipped arrows with this thing, as that would be a sheer waste, but summoned arrows, or even some store bought arrows, would be great ammo to feed this monster.