Originally Posted by
Galedric
I agree with Dappy.
Mastery was in fact buffed back in 4.2 with increased bubble duration, stacking amounts and duration refresh thus better usage.
First of all, mastery is mana-neutral, this is a huge advantage when mana matters. Mastery is also better than haste if you consider 1% haste = 1% healing and 100% mastery usage even with haste requiring less points to achieve +1%. Haste has side effects that mastery has not: more casts = more procs chance, but Daybreak is gone and Infusion of Light depends on shock CD with is not reduced by haste. You still gain some holy power with more Tower of Radiance procs (but it procs only from expensive spells, flash & divine light) and a bit more Crusader Strikes.
Another "buff" to mastery is the new Holy Radiance. Now, mastery procs from every single spell casted by the paladin: Holy Radiance is no longer a HoT and procs mastery fully, Eternal Flame despite being a HoT procs mastery on each tick. About the 90 talents: Holy Prism direct heal (casted on a friendly target) also procs mastery (I don't know about indirect healing but I think it doesn't), Light's Hammer doesn't proc mastery at all and Execution Sentence procs it every tick.
For me:
Spirit > Mastery > Haste > Crit
At least until mana becomes a non-issue. At this time, it's more than possible that the additional holy power gain from haste will yield better results.