Shockadins (that is, Paladins who have a lot of spelldamage (and to a lesser extent mp5 gear) and 40ish holy talents) are quite viable in PvP. In an arena, we heal mostly -- that makes sense in that very limited, constricted, and somewhat artificial context.
In a BG, we can heal and do our DPS thing as the situation warrants. I am a "survivadin" spec, and I get several killing blows (in one on one situations) and also good damage in group kills in each BG from (1) being able to outlast the other guy, (2) SoR, (3) the occasional Shock and JoR, and (4) being able to get out of a lot of CC, and to bubble and heal. It works well. Not nearly the same raw DPS as a ret pally, but I have better survivability and much larger mana pool so it works out pretty well .. and I also heal my team-mates. It's quite fun, and quite doable outside the arena.
Edited, Dec 11th 2007 12:15am by gwynhara