Which GM's out there have Monks in their campaigns? What changes do you typically make to the class, if any?
In my opinion the Monk abilities undermine the fighter character class and introduces a number of absurd notions:
People fight better without weapons than with.
Your hands are faster than a sword.
Unarmed people can beat up people who are armed to the teeth.
As far as the setting goes they don't seem to fit with the Medieval Fantasy notion. Some GM's have tailored the Monk to reflect a more medieval approach -- more like a priest. What is it about the Monk class that people like?