I saw it with my 7 year old younger sister. It doesn't have as much action or plot as the other three movies, and it feels like there is no real big fight or action. Dennis is almost not really in the movie, and neither is Mavis. It feels very short, and I was a little surprised that it wasn't as good as i thougth it would be.
BUT - It was pretty hilarious in some parts, but other than that, its a movie for when the kids have the house to themselves. DEFINETLY not a family movie. If your dad is anything like my dad, then he'll laugh his head off at this movie, critizing it for being so plain and basic.