Hughes' movies were both satisfying and incomplete. He knew what people wanted and had a terrific gift for making a movie in 90-100 minutes...per a Wiki check, he either wrote, directed or produced 31 movies from 1982-2001, all but nine of which clocked in between 83 and 107 minutes. The only one to hit two hours was Home Alone 2, which was right at 120 minutes. Honestly, that's as long as movies should be. I'm not sure who decided you had to have your mail forwarded every time you went to the movies.
But the third act, especially in the teen movies, often seemed rushed to arrive at a pat ending. The original ending for Pretty In Pink (Andie and Duckie end up together) flopped in test screenings so they re-shot an ending in which Blane (Andrew McCarthy wearing a ridiculous wig b/c he was already off to another project) and Andie hurriedly ended up together. His movies also sort of strayed into semi-serious territory and then veered off right away. I guess that's sorta good, b/c the alternative to Cameron smiling and declaring everything would be all right after he wrecked his Dad's car is his Dad coming home and murdering him with his bare hands. That'd be a downer of a third act. And of course today, we'd get a 50-minute third act in which Ferris avenges Cameron's death by hunting down and murdering Mr. Frye.
That said, I thought The Breakfast Club ending was good outside of rushing to pair up everyone except poor dorky Brian. I liked how they generally agreed the bonding ended once they left the building and they'd be back in their respective roles on Monday.
