Originally Posted by Xerophyte
Ho-hum. The best way of upping TPS, is it?
Assume 800 TPS, 70% of listed damage from Shield Slam (20% miss, 10% crit, ~25% DR) and that Shield Slam is used every cooldown
1 Shield Block Value = .7 * 1.45 / 6 = ~.169 TPS
1% additional TPS = 8 TPS = ~47.3 Shield Block Value
That's equivalent to ~30.7 of any combat rating in item budget. Slightly shy of 2% hit, which is slightly more than 2% more threat given 20% avoidance.
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I'm pretty sure everyone who invests into shield block value has talented Shield Mastery.
As such you just encreased the TPS gains of SBV (shield block value) by 30%.
Thus you get 8 TPS = 36.4 SBV.
I'm not sure how SBV is valued at itemisation level ... but that would be something like 1% crit. Does gearing 1% crit get you 8 TPS in tanking gear? I dont think so.
Increasing your hit rating is a wise idea, but you only can get so far by doing this (as misses are capped). Besides, it's not as if you often have the choice to geht either SBV OR Hit rating on comparable tanking items. I don't see SBV and hit rating as rivaling stats.
And you get hit rating to cut the worst cases, less so to improve aggro ... and even than it's hardly superior to SBV.
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Weapon skill rating is likely stronger still, although I admit I am more a little shaky on the mechanics here. Assuming 15 points of skill mean going from ~8% parry, miss & dodge on L73 to ~5% then 30.7 in skill rating is a little more than twice as good as the same amount of hit rating when hitting mobs from the front. However, I could be way off if skill doesn't work the way I think it does...
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The common belief at the moment is that 1 weapon skill gets you .1% less dodge/parry by the mob (though some tests indicate that it only affects dodge twofold, but nor parry). But let's assume 1 weapon skill point gives you .1% less dodge/parry by the mob. Getting 5 skill points (equivalent to 20 skill point rating) would reduce mob avoidance by 1%.
For me that's *roughly* on the same value as investing into SBV. And you have to consider that weapon skill rating on good tanking items is few and far between. Again hardly a competing stat with SBV for this reason alone.
And to add some other point which has been overlooked in this thread: mitigating attacks is upkeeping the rage flow. Avoiding attacks does not.
Try tanking e.g. Lurker (or Tidewalker) in your all out avoidance gear (if you are decently geared you should get more than 50% dodge+parry alone) ... I found the damage dealers in my raid to be threat capped then. Rage starvation is an issue in avoidance sets. Not for mitigation sets though.