I've seen the Brady Kids one the most, because I love the Brady Bunch so I had to check it out, it's kind of strange to see. The Osmonds I've seen a little bit of , the theme song , I kind of like though.
I've just read the real reason they killed off Maude Flanders... Wow. I thought The Simpsons couldn't go any lower, but this is a new level of appalling. South Park has been spiteful before, even towards the audience, but it's rarely towards their own staff.