Building the perfect dad brain requires a blend of smarts, morals and karate skills that can't be found in just one movie dad, which is why we used eight, including Clark Griswold, Atticus Finch and, of course, Indiana Jones.
It takes the focus and the planning of a single individual to make this kind of party a success, just as it takes a focused group of people -- family, teachers, faculty, advisers, and friends -- to get any student to the finish line.
We've grown fond of the characters, which saves the film a bit - on its own, without the backstory, it'd be much less effective. If anything, it's at least a relatively enjoyable experience that you can palate for a short time. Think of it as going down easy in small doses, like eggnog.
The law of diminishing returns is a law for a reason. And nowhere are the returns more diminished than Little Fockers, the third film in a series that began in 2000. With this one, they've barely bothered with a plot.