A friend of mine got a bit pissed off after the TBC talents arrived, he had full epix on his rogue, he had, like, never lost to a paladin. Then, all of the sudden, paladins in blue gear pwned him within a Hammer of Justice. 
You have Hammer of Justice regardless of your talent specialization, although you do get Repentance as the 31st point in Retribution, which is an
incapacitating effect. With the 2.0 patch Crusader Strike was introduced, many people cried about the paladins' "stunlock" with that which is dumb, why didn't they do it before?
It makes me giggle like a little schoolgirl. I wish I was Retribution again, but right now I'm main tanking a Karazhan group, so me respeccing would just be mean and unwanted.. Retribution's not good for raid DPS as it is right now.. but it
is getting reviewed for sustained dps on raids, which makes me happy.
Click here for my paladin's armory profile if you're interested.. that and fear my leet green boots, the Chess Event in Karazhan refuses to yield the Battlescar Boots.
Edited for typos.