Insane amounts of damage with blazing attack speed.
Monks use a sword and a shield and stack up stats that clearly are't meant for them.
It's funny how:
A. Demon Hunters
Generate hatred/discipline and arcane power without having to do anything about it.
They don't have to go close to anything to get their power recharged.
Monks regenerate spirit only by attacking enemies FROM MELEE RANGE, witch in inferno difficulty means that you will have to go and face enemies that will probably 1 shot you.
Let me give you an example: you run away from elite creeps with 30% hp and 0 spirit.
You don't have enough spirit to pop your shield, nor your heal. What do you do?
A. turn around and hope you can land a few hits and dodge their attacks so you can pop your shield.
B. run (and probably die cause you will pull more creeps)
Now you are probably thinking: you idiot, monks do have items/spells that give spirit regen.
Of course they do. The problem about that is: 3 spirit/sec (HORRAY???) from a passive mantra? Oh please... Items? Yes, there are items with spirit regen. BUT they cost tons on AH and they usually cover some other stats that monks need more (such as vitality or dextirity)
Roll a ranged class, kite around, farm items, have fun.