I watched this channel religiously as a kid, and I am deeply ashamed of the crap that is currently on the network.
The only cartoons I like out of this new regime of garbage toons are MAD, Adventure Time, and some episodes of Chowder.
Now, I only tune in to CN everytime [adult swim] comes on. Best block ever with some of the real funny cartoons (like Robot Chicken and Aqua Teen), and then their Saturday anime block is not bad either (but let's lose the Bleach, hrm??)
Some blocks I remember were Toonami, where they showed off the latest anime and action shows like Justice League, Dragonball, Teen Titans, Bobobo, Gundam Seed, etc. That was one of the coolest blocks in the world, but then it got replaced with the crap known as "Miguzi". That's when I lost all attention to the channel in general. Also, The Chuck Jones Show and "24 Hours of Bugs" were amazing blocks.
Some cartoons I remember are Dexter's Laboratory, Powerpuff Girls, Ed, Edd, n Eddy, Mike, Lo, and Ogg, I Am Weasel, Cow and Chicken, Courage, Grim Adventures, Kids Next Door, Foster's, and then others that I can't remember off the top of my head.
Now I just watch Boomerang since CN got so retarded.