Absolutely hilarious FM.
FM's like this, is one of the mastodons on which the entire community rests.
Music fits absolutely perfect, it's like a movie in the early 90's about stupid guard who always fail to guard the mansion.
And I felt this pain of all guards, when you like a blind cat can't find a taffer in completly dark corners and they steal all the loots in the building and you can't do anything with it.

Yes, it is very original mission. Sadly it is not discussed much among players though it certainly strays from usual Thief-gameplay formula (which perhaps IS the cause of it). Surprisingly very dynamic and feels like some kind of single-player Thief-match - since being guard, you must protect valuables from thieves by... "stealing" them first (and under time constraints)! Perhaps the best (and def the most original) mission by Zontik.