Papa-Oom-Mow-Mow

A recent review in The Guardian said that while South Park retained its contemporary edge, The Simpsons had drifted into Mad magazine dotage.  I can agree to a point, particularly as South Park got better later, but any show which can drop a gag involving Goya's 'Saturn devouring his children' into mainstream American culture is surely doing something right (in a non-contemporary way).