We've all been there...we queue up for a random dungeon and end up with the 13k health, bow/bow light attacker tank. Mabye they're a level 15 that sincerely doesn't understand dungeons--if so, be kind and explain. Or maybe they're just a crappy player who wants to skip the queue--plenty of those max cp power levelers out there who think they can hang because overland content is training wheels difficulty. And of course they do it--most people are too passive to kick someone who is gaming the queue.
But, when done right, fake tanking can be a good thing for the random NORMAL (vet is a different story) queue, but if--and only if--1) these fake tanks bring the bare minimum of the tank role to the party, and 2) other players stop being afraid to kick a horrible fake tank.
First, here are the skills a fake tank needs to bring to the party:
1. A taunt (at the very least inner fire, but how hard is it to slot a shield on one bar for puncture?)
2. 20k health. A tank getting 1 shot in normal dungeons is pathetic
3. some basic crowd control (most classes have some of this, but if not there's ice staff WoE and fighter's guild silver leash
4. Enough armor, resists, self- heals, sustain to not die. Basically every class has access to major resolve and some heals; slot them
5. The ability to hold the boss/elite enemies in one place (so don't be Dragon Leaping stuff out of the aoe, fake DK tanks)
6. Some dps of your own. Don't fake tank a dungeon as a dps and do tank-level dps (i.e. 4k or so)
That's it. That's not much of an ask to skip a queue...if players are too lazy to wait in the queue, at least be able to do some of what a tank should do. This helps to address the tank shortage without completely rewarding queue jumping, and let's face it, a tank isn't really needed in norms (but at the every least someone needs to taunt and CC stuff).
FOR THOSE OF US ENDURING THE FAKE TANK: If they're doing the basic job of a tank and contributing some dps of their own, let them stay. At the least, they recognized that they aren't a tank build and care enough to do some of the job while helping the team clear the dungeon faster. And if they're clearly new to the game, I beg you, be kind and explain to them. They're probably desperate to learn, and there's a lot to know in this game that isn't well-explained with no previous MMO experience.
BUT PLEASE START KICKING HORRIBLE FAKE TANKS. PLEASE. Don't be a jerk about it, but please recognize It's for the best for everyone. I know there are so many non-confrontational people around that this is unrealistic, but we can't just keep rewarding crap behavior. In what setting are people allowed to cut in line without getting sent to the back? Jerks thrive on the knowledge that lots of people will just take crap rather than say something, and this enables the behavior.
TLDR; We should expect fake tanks to perform at least some of the role (at the very least, slot a taunt and don't die), or we should stop being passive and kick them (except for new people, we should teach them the ropes). I'm more irritated by groups that refuse to kick than the horrible fake tanks themselves at this point . Refusing to kick someone who has proven to be a horrible fake tank basically says "I'm ok with this person skipping the queue, and I don't care that the other 2 players are going to have a bad time. Let's carry this fake tank instead of standing up for ourselves."
NOTE: I never, ever advocate kicking people based on their level, class, race choice, etc. Always give people a chance to perform.