You might want to check out kolat's awesome thread, which though it has not been updated for Mod 3 in his original posts (which he probably will), he's been mentioning about the feats he's using, etc. on his latest posts.
also with the major nerf bat attack GWF had I recommend you roll a destroyer, otherwise your dps will be laughable also avoid instigator tree entirely my main was a sentinel spec and fo some reason after the nerf my survivability went down I even got one shotted buy the mouth of madness in spellplague.
after respecking to destroyer and focusing on unstoppable building quickly I attack faster more often rolling more dmg and are also tougher because I spend more than 50% fight in and out of unstoppable.
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Focus on power and LS .
after respecking to destroyer and focusing on unstoppable building quickly I attack faster more often rolling more dmg and are also tougher because I spend more than 50% fight in and out of unstoppable.