Oh boy I had good time watching this movie. I had to kill a few minutes in the middle doing some typing and had to stop and restart so I can't give a feeling for the whole movie. As a kids movie I think it is a little better then most non Pixar films. I enjoyed the characters and the monsters were characters unlike most of the monsters and charcaters in these kids movies.
Unlike the ones I normally watch Shreck, Ice age, it had a plot. A good plot in fact. I'm not saying it was oscar worthy but I did enjoy it. You might want to plan on spending a rainy afternoon with the kids watching Monsters Vs Aliens.