Whitest Kids has a low ceiling (unless they've gotten better...?) but when dumb schtick hits, it hits.
All I saw is the first few episodes of the first season.
I saw a clip on here years ago and just thought it was ok; I think it's gotten better. Kind of randomly started watching S4 and 5, which are all on Youtube. Still very juvenile but in the best possible way. If I had to rank all sketch comedy shows, I'd say Mr. Show, KitH, WKUK and The State in that order. The really new stuff is sort of "OK" though.. Kitty History is funny, as is High in Church, but why make fun of Andy Samberg if you're going to do something that's just a funnier Lonely Island?