I definitely agree with your opinion. Ferris Bueller's Day Off is an okay film but it's nowhere near the best 80s film. Like you, I didn't really find any part of it comedic. It's not even John Hughes' best 80s film. That would go to Planes, Trains and Automobiles imo.

Another film of Hughes from the 80s, that's an okay but overrated film, is The Breakfast Club.