And that's what STORKS delivers better than babies or packages: entertainment.
You might have noticed people commenting on how forced and thin the storyline is and how uneven it feels, and those complaints are accurate. The plot is extremely thin (virtually an extended sitcom-sized premise stretched into an epic road-trip format), and the story moves so quickly that it goes too far too fast with nary any breathing room to savor the experience or give the characters the tension or time to build any real catharsis or change. But the characters are so authentic to themselves that you know just about everything you need to know about them from their first scenes.
I think the main reason STORKS gets such middling reviews in print and here on IMDb is because it's an old-fashioned type of comedy: a screwball-slapstick hybrid. The emphasis on sight gags, pain-humor, and wackiness has generally been avoided in animated films as passe and vulgar--low comedy. The rapid-fire snark between the main characters of Tulip and Junior hearken back to the old Howard Hawks workplace comedies of the 1930s, which is definitely an acquired taste in the post-narrative style of humor found in kids entertainment today--where non-sequiturs and punchlines exist in a vacuum and visual comedy is derived from abstraction rather than plasticity. But the comedic energy and the variety of jokes from modern "Office"-style cringe (Pigeon Toady) to the machine-gun-speed HIS GIRL FRIDAYy-style verbal sparring (Tulip & Junior), absurdism (the wolves), post-modern meta-humor (the boy and his parents) to classical WB slapstick of yesteryear, and the film is riotously funny because of it. At the end of the day, that's what STORKS wants to be: FUNNY.
STORKS is not a great film. It's not a masterpiece like TOY STORY or UP. It won't win any Oscars and it won't be everyone's cup of tea. But there's an excellent chance that it will live on as a multi-generational favorite for the same reasons as dumb-fun-with-a-heart-of-gold treasures like SPACEBALLS, DUMB & DUMBER, THE NAKED GUN, and NATIONAL LAMPOONS CHRISTMASs VACATION:
Because you can watch it 1,000 times and it will NEVER stop being funny.
So try it out. There's a 50-50 chance you'll be among the ones who can't stop watching it.