Pretty to look at, but utterly forgettable. The whole thing feels way too similar to several other, better animated films, including, most obviously, "Fern Gully." Also, the stunt voice casting is very distracting. Particularly, Steve Tyler (lead singer from Aerosmith) and his completely left-field musical number almost made me shut the movie off.
Will kids like it? Maybe. But there's so much better stuff out there. Don't waste your time on this or your kids'.