No John Hughes movie can be considered a "classic."
Let's take a quick scan at some of the works in the man's filmography (stuff he either wrote, produced, directed, or all of the above):
Mr. Mom
Sixteen Candles
The Breakfast Club
Pretty in Pink
Ferris Bueller's Day Off
Some Kind of Wonderful
She's Having a Baby
Home Alone
Home Alone 2
Home Alone 3
Curly Sue
Beethoven
Beethoven's 2nd
Maid in Manhattan
John Hughes defines cinematic mediocrity for comedies in the same way that Ron Howard does for dramatic films.