Root doesn't hold when people are casting damaging spells on a mob. If it's dot's only then it's chances of sticking and staying are more. But usually there is some sort of a spell caster using DD's on the mobs. I could be mistaken but maybe even weapon procs act as if they were DD's and break root.
When I solo as a Wizard I am lucky to get two nukes off on a mob before root wears off. So the chances of root actually sticking through the entirety of the fight are slim. Not to mention most people don't pay attention and get close to the mob to DPS it and get damage taken themselves.
Then there is always the risk of rooting a hard hitting mob next to your cleric, or a caster and instantly causing major problems.
Root by in large has it's uses. Especially for ill-equipped groups just trying to ghetto through a camp without a tank. But to me it makes more sense just attuning yourself to the word aggro and doing everything you can within those bounds. I know Warriors are a little bit hindered in the aggro department, but that will change with better weapons and Velious expansion.
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