I like my 5x pallys, I was originally 5x ret and the main would die once in a while. I've been doing as many dungeons as possible.
I since have switched my main to be prot and he dies a lot less.
I would have thought I would loose a lot of DPS on him but sometimes he's at the top of the DPS chart if enough mobs are beating on him ( ret aura ).

I just flipped 71.
I've done most of the dungens below leve 70, I've done Shadow labs at 69, magisters terrace at 70.
I never quite got the last boss down in UK @70 ( very close a few times) but that's because they nerfed you being able to drink or eat inbetween fights and I forgot I even have lay of hands...
I guess if I get some health pots and now at 71 I have divine plea I'll try it again I'm i'm going to have a lay of hands macro ready to fire.... he's going down soon.