These are my thoughts on each Cartoon Network Original Series. Just remember that I still find T.U.F.F. Puppy the best show

The Moxy Show: I haven't seen much of it in years, but I remember really enjoying it and revisiting some of it, it's still very good stuff
Space Ghost Coast to Coast: Hilarious show that is pure greatness
What a Cartoon: A fantastic collection of Cartoon Network pilots. Much better than Oh Yeah! Cartoons, which was hit or miss
Dexter's Laboratory: Such a classic show that holds up very well
Johnny Bravo: Hilarious and classic
Cow and Chicken: Fantastic show. I actually like it more than Dexter and Johnny desu. It had some of the crew from Ren and Stimpy on it
I Am Weasel: Not as good as Cow and Chicken, but it was alright
The Powerpuff Girls: Loved this show. I found it a thrill to watch and a power of excitement
Ed, Edd n Eddy: Easily the best of the Cartoon Cartoons
Mike, Lu and Og: Boring as fuck
Courage the Cowardly Dog: I really do love this show. Very creative stuff
Sheep in the Big City: A love letter to Rocky and Bullwinke. Great stuff
Time Squad: I found this show to be fucking stupid. It's nowhere near as good as Peabody's Improbable History. Not to mention, Otto is fucking annoying
Samurai Jack: A masterpiece that I still love to this day
The Grim Adventures of Billy and Mandy: Brilliant
Evil Con Carne: This was a great show and should have lasted longer
Whatever Happened to...Robot Jones?: Boring as fucking hell. Nothing happened in this piece of shit show
Codename: Kids Next Door: Really creative and original stuff
Star Wars: Clone Wars: Epic and badass