There was usually a comical, slapstick cuteness to the original Diary of a Wimpy Kid book series. The kid-like "notebooks" full of scribbled misadventures and pencil-drawn stick figures had an undeniable charm. Unfortunately, all the stuff that passed for "cute" in the Wimpy franchise's books has been squeezed out of the film series—leaving little more than an unpalatable pile of poop jokes behind.
Sure, Mom and Dad could rationalize that their tykes might be amused by this pic's gross-out silliness. But trust me, the clownish antics on display here aren't admirable ones—especially when the onscreen adults lead the charge. And the obnoxious, deceptive kids are, well, obnoxious and deceptive.
I suppose The Long Haul could be worse. I mean, there are pre-tween pics out there that tread even messier ground. But, frankly, that sad observation shouldn't be construed as any kind of argument to sit through this scatological pic.