I've heard that this is meant to be like a Japanese version of The Simpsons, but I think it's unfair to compare.
It's a little more sophisticated, which may alienate the younger viewer, but this is one of my 6 year olds favorite Ghibli films.
Made up of lots of little 'sketches' that are consistantly funny and true to life.
Not the usual Ghibli animation style, this is looser and more sketche like. I think there were different animation artists too as the style varies in areas, which are noticeable.
An early Ghibli - don't buy it if you're looking for a typical Ghibli, but if you're a real fan you should enjoy this, even though it's quite different.