Well, just going by the artifacts' and set items' stats, Blizzard's original idea was that all three paladin specs would want Crit and Mastery, but so far only Holy and damage oriented Prot paladins work that way, due to cooldown-scaling with Haste.
They should really change Judgement so that it grants a buff to the Paladin instead of marking the target and that the duration matches the base cooldown. That way Mastery would not add a cap to our cleave or limit target switching, nor would it force stacking high amounts of Haste (and adjust our base cooldowns so our rotation goes a bit faster than a snail).
Talent changes should only come after that.