While the animation was gorgeous and full of fun imagery, I felt the story was a touch lacking; especially with its two main characters. They were the stereotypical big doofus brother and insecure/anxious little brother who have to find common ground on a buddy road trip.
Honestly, if the story had focused more on who the father really was and perhaps made Barley more of a father figure to Ian, I feel it would've been a lot more heartfelt and possibly have made me cry happy tears. But it followed a very typical formula of two brothers who don't understand each other, have a touching moment, then fight and blow up at each other, then give up, then join back together to defeat the 'bad guy'.
The adventure itself was a bit bland and chuck full of random filler moments that added nothing to the overlapping theme. And speaking of which; I don't really know what the theme was... the tone was all over the place, too, which didn't help matters either.
It's a harmless movie that'll surely make you laugh (as it did for me), but as storytelling goes it's alright, I suppose. Not groundbreaking like other Pixar films (Toy Story, Up, Inside Out), but you'll have a good time seeing it.