I'm no tank so I don't know the specifics, but in my experience of healing pug tanks in ~15-16s, DHs can facetank much MUCH better than paladins or DKs. They don't feel squishy to me at all...
/edit: What Gasparde said is more like my experience as well. Except for the fact that he said palas are good at kiting... I don't think pala tanks are good at anything right now unfortunately (except dealing damage). I've had some pala tanks who were good at kiting and even facetanking some packs, but about 90% of pug pala tanks are worthless unfortunately and I try to avoid them in 15+ keys if I can
but yeah, the 50% slow on consecration and 45 sec CD horse does not mean palas are good kiters.