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I was under the impression that a 2h slam build wouldn't yield as much dps as dual wielding in raids.
Yeah, that is true. But the itemization of the gear for fury requires much more hit. Which you will be socketing for instead of crit or AP, which is what you should be socketing instead.
D/w will outperform 2h slam for single target tank and spank DPS fights as things are now.
But for D/w to truly shine, you need over a 100 hit rating easy. A majority of your DPS comes from white damage. Increasing white damage throughput to the point where you generate enough rage to fuel your BT/WW cycle on every cooldown. Then increase your crit and AP. Crit easily replaces To Hit after a point, but you still need to make sure you never miss your specials (~89 hit rating with 3/3 precision).
2h slam is easier to gear for, and requires less To Hit for perfection. 133 hit rating with 2/2 weapon mastery or 89 hit rating with precision, for every hit to not miss (but still can be dodged, parry, blocked.). Then just stack the AP and Crit. No need to bother with balancing 3 stats, or having issues with min/max gemming.