I liked Samurai Jack. Now, "The Grim Adventures of Billy And Mandy" are my favorite.
"Ren & Stimpy" were great in their day. That is, until the creator John Kricfalusi was fired by Nickelodeon in 1992 after continuous battles over script content and control. He went on to create the hilarious webtoons "Goddamn George Liquor Show" and "Weekend Pussy Hunt." In 2001 he created a short-lived Saturday morning cartoon "The Ripping Friends."