Actually, it didn't break roots in TBC. I don't think, anyways.. it's been a long ass time now. It was just usable while rooted. So it'll allow that kick or gouge or kidney, or stepping to safety to a friendly target, albeit still being in the root.
Dunno. To be honest, people can say "We'll wait until 90 to see how it is before we whine" all they want to, but the way it is now, rogues truly do need some work. Backstab/mute specs suffer a lot to since the crippling nerf, and herpderp shiv cooldown.
...by the way, are we now the only class who had a spammable snare, that's no longer able to be used on demand any longer? Weee.