I remembered seeing some videos of 4-5x Spriests from back in Vanilla and the self healing alone was pretty crazy, so i went and checked what the % on Vampiric Embrace was back then(on Classicdb.ch). It seems to be 20% with the option to put 2 talents into Improved Vampiric Embrace for another 10% total. So yeah, i think the self healing alone would be pretty good.

Also lol Feign Death resists, i remember going afk while FD in Ironforge once and came back to my Hunter actually dead, fun times.