I played a paladin in Vanilla. At the time I barely knew what a damage meter was. Only thing I saw was great numbers flipping about my screen when seal of casino procc'd. I was a beast in PvP. Could outlast almost anyone and could potentially burst any class down in mere seconds, ..... with loads of downtime. So I thought I was great at dps for a time.
But after some "schooling" on dps meters etc... I knew I was dead wrong and was better off playing buff/cleanse/heal bot. Even though I was prime gear for my retri spec. It did not matter really.
In TBC DPS became better for retri paladins. But still not quite there. The discussion about "pure dps and hybrid specs" was a very vivid one. I still think that hybrid specs should be less in DPS/Tank/HPS, but possibly make up for it by buffing something else.