I've been watching World's Dumbest practically since it 1st aired.
While it's not 'high brow,' it IS funny. The old adage, that says you throw enough stuff at a wall, and something will stick, is true. Like a burlesque comedian, who just keeps spitting out jokes,the large cast provides enough material,that there's something EVERYONE will find funny.
My personal raves are (in alphabetical order); Danny Bonaduce, Todd Bridges, Judy Gold, Brad Loekle, and Chuck Nice. My absolute LEAST favorite is Frank Stallone (ugh!)
There are a bunch of 'one-offs' - people who appear for an episode, here and there,mso the cast is always interesting.
It's been a staple of mine, to watch World's Dumbest every Thursday night, before bed, for a number of years now.
It's the only thing on Tru TV that's watchable.