I've been using a 45/0/16 spec for a few weeks now on my Pally. Since I am still running normal quests and dailies I really don't need my healing set on all the time. So I use a mix and match dps set along with Oathkeeper. In a normal non-elite encounter I judge Crusader, Hit seal of Command, and proceed on smacking them with my 2-H mace...with the occassional shock/exorcism/consecrate thrown in.
My reasoning was that I wanted to preserve what little dps I had for questing while still being able to main heal instances. I would switch to a more cookie cutter Holy/Prot build when it was needed. I was dazzled by the occassional big hits and was quite proud of the damage I was dishing out. I was skeptical of what everyone on this board was telling me about doing this. It seemed to be working well for me.
I stuck with this for weeks.
Then I looked at that the dps tracker that is part of Cosmos (the one that tells you your dps over the last 30 secs). I compared this to my alts. In spite of the occassional big hits, I was horrible over a 30 sec time frame. My lvl 53 hunter was doing comparable damage. And I won't even discuss how badly my 63 rogue and 65 prot warrior were crushing my output. It's depressing. I was trying to play like a retadin with none of the tools to pull it off.
It's apparent that most of my dps is coming from my spells (shocks, etc). I don't think that switching over to Holy/Prot and using a decent one-hander with a shield will decrease my dps that much while increasing my survivability ten-fold. I'm not even sure it's even possible for my dps to drop any lower.
Just wanted to tell everyone that I was WRONG and hopefully steer people clear of making similar mistakes. If you are Holy spec...don't try to use that impressive 2-hander. It just doesn't pay off in the long run.