while i agree that tanks need to be addressed (all tanks btw), youre acting like there is no penalty at all for being tank spec on the shaman and would be wrong about that.
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range is a huge limiting factor. 10 yard range on lightning bolt/chain lightning/ lava burst. melee range on earth shock too.
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while you do get sp from + def on the shield mastery rune , not having burn+ flametongue limits the damage you can deal. also this 150% armor is only procced off blocks (that dont always happen) and only at 5 stacks of the block do you get it.
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you have to have 5pc zg set to even have a hope of doing any damage and must rely on procs that sometimes never happen. with the set its 10% but still.
even then you have to be within 10 yards range to even get the spell off.
but ya.