The Simpsons is pure genius. It is one of those shows that can be watched by virtually anyone.
It has the stupid humour from Bart, Nelson and the bullies which is attractive to the younger audience. It has the political satire and social comment that is missed on the young audience but is extremely humuorous to the adult audience.
If you name any social issue, the Simpsons have covered it in at least one or more episodes.
The only reason that I don't watch it EVERY day is because I find that I have seen many episodes three or more times.