For the Galka Monk post:
There's more to tanking then HP and hate, too. When I play my WHM, I could care less how much HP you have, to be honest. VIT and DEF are the utmost priority, to me. I posted this in another thread, but I'll say it again. If you have 150hp, I can keep you alive as long as you're not getting *pasted* with every hit. And with their low DEF, MNK's do get pasted. Yes, with high evades, counters, and Dodge stacked, you can make a fair tank - at lower levels. But relying on a percentage chance to not get hit sucks. It's either spectacular success or spectacular failure, and a fair chance at both. With a WAR/* tank, it's usually just "good success."
As a WHM, I can tell you that of all the classes, I hate having a MNK tank the most. Why? Because that huge HP total gives them a false sense of security, but their low armor means they get *clobbered*. And my Cures heal a set amount of HP, which means they're worth far less on a MNK than on a WAR.
Put it this way: The WAR gets hit for 35. The MNK gets hit by the same mob for 45. My Cure gives 30-33 HP back. I can heal 86% of the WAR's damage taken with Cure1. I can only heal 67% of the MNK's damage taken with the same spell.
That said, I have to add that I love MNK/WAR as my backup tank. They can do good damage when they're not tanking (with Boost stacked), and if push comes to shove they can eat some hits with Dodge stacked. I do usually demand a WAR as a main tank (if no PLD's are available), but I'll take a MNK as the backup any day. A WAR as a backup tank doesn't do as much damage when he's not tanking (which he won't be 90% of the time, if he's the backup).