I don't know how Ret may scale well. Mastery is completely atrocious, way behind the other stats in benefit. Haste loses the greatest part of its benefit when you get what is virtually constant uptime on the debuff.
That doesn't look like good scaling at first glance to me. I think that mastery needs a buff for that same reason.
45 second CD regardless of charges , in a dungeon where people are constantly rolling/leaping/sprinting/blinking from pack to pack they do not go a long way, the sustained mobility is frigging awful no matter how you spin it.
The idea that I would not know I have the spell when I've been complaining about it since alpha is laughable :P
Last expansion and this shit again, praying for bandaids.