A simple idea to tune down on the absurd scaling you can get with boring talents. Any talent that increases a stat by a % should only apply to specific armor types; as an example Sinister Calling in the subtlety rogue tree would give 20% agility from leather armor while Lightning Reflexes from Survival hunter would give 20% AGI from mail armor.
Likewise stances could see some changes
Shadow form should only reduce threat gen on shadow spells and healing effects. You can't cast any healing spells in shadowform but this retains the threat reduction should someone use Vampire Embrace. Its too easy to instantly remove 30% of threat as a dps with the current form.
Strength of Arms from the Arms tree should buff battle stance, either making it similar to Improved Berserker stance or changing it into extra haste or ArP ect.
Deadliness in the Subtley tree should only work while in no stance or in stealth/shadow dance, as it would on a rogue.