Most of the examples in the OP weren't original CN productions.
Whatever happened to stuff like The Grim Adventures of Billy and Mandy? I miss that show... great series.
Ever since they took that, Powerpuff Girls, and Dexter's Laboratory off the air, CN has gone down the tubes. Even before Toonami officially died, they were crap, and they remain crap today.
Same thing with Nickelodeon, tbh. Does anyone other than me remember things like the original Ren and Stimpy show? How about AAAAAH! Real Monsters!? Or The Secret World of Alex Mack, Are You Afraid Of The Dark?, Clarissa Explains It All, and The Adventures of Pete and Pete?