i agree being rooted bites big time.. i am actually kinda used to it now though. i used htl alot in my teens and twenties, and often on raids to get that little bit extra aggro. one thing to consider is some other classes also get rooted to provide better spells; i know that our warden in group will activate his macro "Healer is ROOTED now!" before tuff fights.. i think the spell is Duststorm - it used to provide additional avoidance but now just increases chance to stun mob * i think not sure * - Anyway I tell everyone in group to pivot on the healer if we get adds; I will hit MD again to cancel, switch to the add and taunt either single or AE, pull all mobs closer to healer, switch back to orignal mob(s), hit MD again and then usually hit tremor to provide an area attack to let all the mobs in the area know i mean business.
you have to have some strategy for sure; and i think us guards have to have good tactics for sure to be successful. one thing im not going to do is let being rooted stop me from being the best tank possible for my guild.