In regards to the original question, Haste is better than crit....up to a point, which I think Irs mentioned above.
Anything about 550 is kinda wasted as you start clipping GCD to much and crit therefore becomes a little better......until that point though its always better to go with haste as an affliction lock.....DON'T Gem for it though
Pandemic accounts for about 5-6% of my total damage, so its not bad having crit I tend to hover around 20% odd and as Corr and UA is about 25% of my Dmg it works out about right.
But Unless your clipping the GCD, haste over Crit for affliction locks every time
M.