My problem with Saturday Night Live is that they use random guests like Johnny Carson or David Letterman would do. It works for TV talk show hosts because they're able to make the conversation humorous without having that burden placed on the guest.
SNL however will have various guests participate
in a sketch where they follow a script. The problem there is that just reading/acting from a comedy script is not going to make it funny. And since many of the guests are not comedians, or particularly funny, SNL has had a number of skits where non-funny
people are attempting to come across as
funny. And often times it just doesn't work.
MPFC were not special guest
oriented, so they didn't have that problem.