Before you say anything, this is not another "KOKSTAH, Y U NO MAIK THAH GAM RILISITK" thread. I'm just looking at what was the most unrealistic mission in your opinion and why?
Mine is: The Bureau Raid - Fire Crew. It made no sense how FIB never checked the janitor (Michael) for any weaponry. Especially for 3 sticky bombs which literally blew up half of the building.