Someone worked out a while ago that with Turgur's mobs will bash approximately every 32 seconds. Even Togor's reduces attacks so drastically as to make stun-interrupts more-or-less a non-issue. Point is, if you can't get a root off in a 32 second timeframe you've got bigger problems than what race you play.
Another thing to keep in mind is that Torpor is a level 60 spell. Yes, innate regen is sort of irrelevent if you get Torpor, but 1-59 is not an insignificant part of the game and innate regen makes levelling a lot less painful (the painfulness of which is not to be underestimated 1-34). I personally know I will probably never get my shaman to 60 and if I do probably won't be able to afford Torpor. I'm pretty casual though.
Barb has access to BSH which along with the JBB can dish out some pretty serious mana free DPS.
All races have practical advantages except Iksar, whose only advantage is their sweet looks.
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