>>106791169It's massively underrated because along with Cars it was the only Pixar movie between 1995 and 2010 that wasn't universally praised. (But Cars still got multiple sequels because it sells a shitload of toys and because the franchise was a Lasseter baby).
Also, I think that money related issues aside, they never bothered with a sequel because insects reenacting the Seven Samurai plot simply isn't as whimsical or as interesting of a setting as the rest of the Pixar universes.