Well, I've read many bad CPs in my day, but these are the top 10 worst.
10- Happy appy 2. It really didn't have a plot, and too much unneeded gore.
9- Hope is lost. It suffers the same problems as "Happy appy 2", and uses the sad "I was an intern at ___" cliche.
8- Sesame Street- fan episode. It suffers all above, and many sexual details. It can be found currently on Trollpasta.
7- John's Journal. Not good. Move on.
6- Red Mist. It's basically "Squidwards suicide", but if you add enough crap, this pasta is created!
5- Jeff The Killer. I'll get hate for this one.. But let's admit it, it has no complete story.
4- Papercuts. Too much gore, cliched, and no story. Great, huh?
3. Aladdin is dead. How can you even fucking read this? This guy should go back to English class.
2- Sonic. Exe. Cliche, gore bla bla bla
1- Trouble guppies. Just because every cliche in the book, and the guy who created spammed the chat just because it was deleted.