Can't even solo tank it either - if you could solo tank and not rely on some totally random tank that may or may not know what a taunt button is, or any tactics for anything, that would be an improvement. I hate not having any control over the quality of my off-tank - I'd rather tank with the proving grounds NPC than the majority of the guys I've seen in LFR.
You're normally guaranteed to get a least two decent healers out of six, but it's more like 50/50 on if you get someone decent to tank with.
That and I hate the default position where I am expected to tell the guy tactics if they couldn't be bothered to look before they joined, which is so not my job.
Because I can queue as Healer/DPS and set my loot to tank for the one trinket I actually want, so I don't have to. I'd rather heal a shit tank, than have to tank with them.