Technically, tiger strikes should provide an equal benefit to 2H and DW - even though they proc less often, the 4 attacks they buff each do more damage than DW attacks. Ability damages are absolutely identical, because DW factor is applied that evens them out.
Thing is, dual wield auto attack always was more powerful than 2H, simply because attack power scaling is higher - AP/14 is applied to both weapons, so total final AP contribution is AP*1.5/14. 19% miss penalty partially compensates for that, but its not nearly enough. On the other hand, base weapon damage ends up being a lower factor with DW.
2h: More stats (I guess enchant offset), haste gets more valuable for autoattack since it scales multiplicatively with the 2h passive.
That doesn't affect the value of haste in the slightest. Damage bonus is also multiplicative with haste, you know.
AND I don't give a damn about haste - I found out that with our limited stats on gear, mastery is actually quite better until you are GCD capped.. and since there is nowhere near enough haste to make energy regen that high, getting Combo Breaker procs actually make me more occupied than waiting for energy to use Jab again and again.. Though this will change as soon as blizzard gives us more secondary stats on gear.
Mastery is way worse than haste in any gear, just fyi.