When you put it like that, there's no denying it.
Rework Holy Retribution to not cost turn undead at all, but instead give it a 15/12/10 second cooldown. And make it something simple, like a +?[W] bonus and some light damage. No save. That would at least be something.
Change the censure line to work on all evil mobs at tier 5. (The tier 4 can stay the same.)