The thing is each of the MT's are supposed to have clear advantages and disadvantages. Paladins buff their healers and thereby make healing much easier and can cure their own detriments and even the groups (Zealous Smite). Monks bring more damage but they are much harder to heal because when they do get hit, it hits much harder which means if the mob spikes in DPS then a Monk should be subject to a one shot, however they aren't because they have nigh permanent temps up to protect them from that. Guardians on the other hand do sub-standard DPS, do not buff healers or damage and do not have significant defense-buffs to protect the group that are reliable (Guardian Sphere is a proc, procs are unreliable for AE's that kill). They also do not offer any real significant increase to survival over the Monk or Paladin. That is the core issue with Guardians and Monks doing a very disproportionately high amount of damage. Now monk's like dealing damage, we all do. So tie it to "not tanking" they can fill a DPS roll or Tank roll as a Tertiary tank or as the MT heck even OT in situations. However they are best suited for situational tanking and better help the raid by adding and buffing DPS. Let the low-hitting but survival oriented classes do the MTing. The issue is that most players don't seem to see that, all they see is the "glory" of being the one to tank the main boss. Screw inter-raid support if you aren't the one tanking the boss or tanking the main/swarm adds, your worthless. That is what it feels like raiding has been reduced to in tanking. "MT or bust" seems to be the motto when making balance suggestions on the Forums and it's led to horribly imbalanced classes despite them seeming very balanced. They all do the same job, so close in fact that anyone who doesn't do that job best get's benched.