It would be a defense to say that Monkey Island is quite niche compared to some things.
However it IS a big thing and there IS a lot of defined knowledge and truth about it, arguably more than what is available about various jobs.
I keep being disappointed too. It is surprisingly easy to get a good looking proof of concept using it on a small sample but as soon as you go "live" it falls apart against real life.
It's impressive how much it CAN actually do, just I wish customers/managers would match their expectations.