WynautQueen
Pokemon Caretaker
Wow. I'd like to see that.
What, the list? The Cardcaptor Sakura dub was pretty awful, and La Blue Girl's is sadly poor as well-- but that's a hentai and the Japanese voices are pretty bad too. Then there was some show that was on Cartoon Network, some battle monsters show. I don't remember what it was but the dub was really unbearable.
That's all I can think of right now. There are lots more shows where I prefer the Japanese, but the English dubs are still bearable if it comes down to it.