The writing, of course, is top notch. The animators are absolutely devoted to the show, and of course, the actors kick things up to a different level with their performances. When the show first started, it was considered almost subversive. President Bush made that famous dig at it. It just shows that cultural critics are generally humorless prigs.
Society can survive entertainment that has a slight edge to it.
You have two young boys, age 8 and 10. Oh yeah, they give notes. They read scripts. I don't ask them to, but they give comments anyway. So much of the show's humor is directed at adults.