The ideas behind this silly bit of fluff are wonderful: how does an older child deal with the arrival of new baby, particularly an older child with a rampant imagination. The execution, however, is mediocre. The issue is deep in the conceit of how the tale is told. What is fantasy and what is reality gets more than a little munged and, frankly, confusing.
The voice talent is solid, but nothing groundbreaking. It is a long comic stand-up routine that provides a lot of one-liners, but very little acting. For that purpose, they found the right talent. For emotion, it relies on cheap tricks, like singing Lennon and McCartney’s Blackbird to pull the heart strings and giant anime eyes on everyone to pull out a physiological response. If I sound a bit cranky on these subjects, I am. I prefer movies to earn their moments rather than manipulating the audience. And, honestly, a good part of the movie left me nonplussed as it focused on absurd aspects. And we shall not even discuss the climactic scene and results. It may well have been intended as all fantasy, but that isn’t how it was presented as we see non-fantasy points of view of the action at least a few times which means it has to be actual events, not just Tim’s imagination.
Writer Michael McCullers (Peabody & Sherman) had a clear blast slipping in all manner of old references, from music cues, to visuals, to puns. There is plenty of private joking going on for the adults, if they’re paying attention. And, of course, there is a lot of cheap baby humor. Director Tom McGrath (Megamind, Madagascar 3) tackled this script relatively well on the voice side, but didn’t manage to overcome the oddities of the story telling. He should have committed to it being complete fabrication or complete reality. The in-between state appears to entertain, but also manages to confuse and leave it all incomplete.
What you end up with is an entertaining mess, from a pure movie point of view. However from an entertainment perspective, it will connect with anyone who has had or taken care of a baby. I’m not entirely sure it connects on the sibling level the way it was intended, but perhaps that is because it took almost half the movie to focus on that in earnest. If you approach this as just a way to see a bunch of short, funny moments, with a thin thread of plot, you’ll have enough fun to make it through the 90+ minutes. But a classic this most definitely is not.