Originally Posted by
Larynx
Some haste is not bad. On a micro-scale, the different between a 2s CH and a 2.5s CH matters far more than the overall throughput loss by getting the haste over mastery. Same with single target healing and riptide/tidal waves.
That said, in a raiding context it's probably never worth getting haste over crit or mastery when the crit and mastery is already available. It's just not terrible if you get a haste itemized piece. Point for point, crit/mastery are much much better than haste for throughput alone, not even considering the HPM gains over haste.
Mastery vs Crit is a better question. If you're not seeing the benefit of your mastery very often in the content you're doing, it's better to go crit. Crit, point for point, is better than mastery at 60% average raid health. Mastery is technically a bit more overall useful, since healing done at critical health counts for more than healing done at 90% health just from a raid utility PoV, but there you go.
haste = 325 per 1%
crit+QA = 296 per 1%
mastery = 296 per 1% @ 60% health
In case you wanted to see the difference between haste and the other two.