Alternately you can treat it like most people treat Mar'ii and have an out of range tank standing with the dps/healers who taunts and drags bloodlord back to the MT. Also have your shamans drop searing totems near the MT... sometimes he will reaggro on those and it makes everyone's job simpler.
Also I've said for ages that the spears were a LoS bug that was going to be fixed :V
For like a year we never used those. Then we get an x-server recruit who says in the raid one day, "Why do you guys do this the hard way?" Month later it gets nerfed.
Though I concur that sac'ing a couple rogue alts to beef him up to make it a more challenging fight is fun. Personally? I withhold heals until he dings about 3 times. Then I start smiting. <3
Ultimately yeah though, this is very much a "Do your healers suck?" fight as much as it is a "Fucking taunt plz" fight. If your healers haven't learned how to use /assist to watch for quick agro changes you'll have a much harder time. Far less deaths if you can land a pw:s or start a quick heal before Mandokir actually gets to the new target.
Reactive priests make me a sad panda. It's all about proactive healing.