I can't get into the silly anime shows like Fooly Cooly or Bobobo-bo Bo-bobo. I tried to get into Zach Bell, but it got too silly for me sometimes and Cartoon Network just kinda stopped showing episodes before even finishing the current story arc the anime was in, making me sort of disappointed.
Boring anime also gets to me sometimes like Morbito. Paranoia Agent was the only somewhat boring anime I could get into to a certain degree, but half the time I felt like falling asleep while watching it.
I also have trouble with a few of the kiddie shows, like Beyblade and Rave Master.
I'll also agree that the One Piece dub done by 4Kids was awful. I recommend people to read the manga instead. As one guy I remember saying about One Piece during his demonstration of how to beat Super Mario RPG on Youtube said, One Piece was kinda 'raped and ruined' when it came to America by the 4Kids guys, and by the time Funimation got the rights to it, it was already too late to save it's interest to viewers.
Personally, I'm really hoping some new anime comes to Cartoon Network soon, and hopefully it will be anime that's actually entertaining besides Bleach or Deathnote. They seem to be giving long time anime fans who watch their adult swim line up the cold shoulder recently. Syfy seems to be more caring to anime fans these days than Cartoon Network, unfortunately their current show Monster is another boring anime to me.