Parry haste was removed in cata, for mobs and players (if it ever existed for players).
Not really sure about the rest of the tanks, but dk's get some weird results from parries.
I've noticed it a few times and another guy on the dk forums did an actual test with a swing timer addon, dk's do gain some sort of parry haste, however it doesn't update on the paper doll.http://us.battle.net/wow/en/forum/topic/7708991260?page=2#30
second page, 11 posts down.
With that being said, dodge and parry are fine as is.
People say that dodging/parrying an attack for example lowers a blood dk's mastery value, which from that standpoint could be considered true.
However would you rather take a hit that you healed back 20% of it and added a shield for 60% of that hit or just take zero damage period?
Could they rework it a bit to fit with the AM model?
of course, but that won't happen until next expansion, if at all