Depend what you want to do. Do you want to do PvP?
If yes, this spec can be a good compromise for flag currier, or arathi defender.
For PvE you need better talents. Reckoning is useless because you want to cap defense and become uncrittable; Toughness is a must, for armor bonus, because 95% of time you will use Retribution aura for maximise your threat; You don't need Blessing of Kings, you will use allways Sanctuary on you, Salvation on dps and Wisdom on healer; Guardian Favor and Imp Hammer of Righteous are PvP talents, not very useful in PvE, you need to safe your mana so, you need Benediction and Deflection for boost your avoidance.
Theese are two alternative for pure pve:
Pure MainTank spec and
Lay on Hands Alternative