One would assume it's an hour and a half of pure comedy goodness, but cartoon to movie adaptations rarely are. Chances are it will have a typical movie plot structure, an antagonist of some kind, and a lot of slow moments that are supposed to be sad or dramatic.
Look the the Power Puff girls movie- it tried to be serious and had these long drawn out moments of drama. I mean this is the Power Puff girls. I expect nothing different of this movie.