I've been messing around in protret with my paladin the past few days. Before I go on, my gear is HOBBILE, so before you post "qq l2 rating" this is with mix hateful pvp and some nax pve gear, just to see how it would go.
Its actually ALOT of fun coupled with amazing burst if you glyph Avengers shield and use a slow 1h dps weapon. I've been 2v2ing with a Prot warrior and in the 1.2k rating field we went 21-8 (Granted like I said, its a noob bracket but the gear just wasnt there for us.) So with better gear I plan on pressing this for a viable pvp option for paladin who are bored of ret.
Ps. The changes to Touched by the Light will also be a nice buff to this spec come 3.2.2 damage wise.