Personally haven't had any issues with Righteous Defense. May want to consider the 10% Judgement Damage Glyph instead, but spec looks kinda solid and may respec to it when/if I need to pick up kings for a raid. Only thing I would recommend is getting Tuskarr's Vitality on your boots when you have a solid pair. Cause run-speed is always nice being that you aren't going with pursuit of justice in your build.
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Regretful - Female Blood Elf Paladin of Mannoroth
Subject - Male Human Paladin of Arthas (Sold Pre-2.4)