I'd love to see some evidence of that. I just can't see haste being only a 1% DPS loss when you reach the point where you are frequently resource capped. How do you account for multiple targets in situations where crit is clearly superior as haste does nothing for diseases? And what about situations with periods of vengeance downtime, e.g. every tank swap fight, and refreshing diseases to take advantage of high vengeance periods?
For what it's worth, and this is basically going to be anecdotal evidence so take it with a grain of salt, what works for me is the following priority:
7.5% Hit/Expertise > Haste until you reach the point where you often cap resources > Crit > 15% Expertise > Strength.
Obviously this is purely for DPS, your mileage may vary and if you are worried at all about survivability then you are best off focusing mostly on haste. I've tried pure haste and, for me, it just didn't match up. For reference:
http://www.worldoflogs.com/guilds/79...ayers/#tab-DPS &
http://raidbots.com/epeenbot/eu/kazzak/auk/. You can clearly see that crit doesn't only appear to perform well when the stars align, so to say.
Expertise hard cap is better than strength but it's still fairly low on your list of priorities.
Death and Decay is definitely a single target DPS increase if the target will be in it for the full duration, even more so when prioritising crit over haste. You don't want to use it when you don't have a proc though.