Many times in a cramped room the mob will just about reach you before you finish casting, stun you, then land a couple more rounds of hits before you actually manage to root it. If you do a lot of cc in dungeon groups I can totally see that fraction of time being worthwhile.
Also consider the recast time being greater than the cast time means if you need to do a lot of rooting you may want to have two different root spells memorised.
I'm going to be honest here and say on my wizard (sub 58) I'll typically just use Enstill. It seems to be the best general use root.
Maybe I should buy immobilise and give it a try. Perhaps its fastcast will make it better for soloing with rains?
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