The third act is a hard drop from the hilarious and unhinged first two acts of the film. Ben Stiller is completely insane.

This is still hilarious and heartfelt. But it does falter when Ben Stiller isn't onscreen.

...a decent-enough endeavor that’d hardly be worth mentioning were it not for Stiller’s superb, scene-stealing efforts...

Time has been kind to the discarded fat camp movie, finding Heavyweights more digestible these days, after years spent processing the askew sense of humor shared by Apatow and Company.