This was a decent movie. The animation was good. The comedy provided by the slugs was good. And the premise was good (although pretty much ripped off from a much better movie from a few years back called Arthur & The Invisibles). But that's really it. It was a good movie but not really much else to say about it.
I would somewhat recommend people checking this out. For parents with younger kids, there really isn't much else out there. Don't get too excited that this will be one of those equally as great for the parents animated movies. It's watchable but ultimately just kind of there.