A commonly cited example of this would be One Piece.
However, I will have to give them a bit of credit...they did do one thing that I liked (and only one).
The first opening theme to 4Kids' One Piece dub was (like every other edit they provided) completely unnecessary, yet unlike their other changes, entirely awesome. When I was a kid and woke up early on Saturday mornings, I would shout along with it.
Listening to it now, waves of nostalgia wash over me, and damn it, it still goes hard.
*Thankfully, they seem to have some respect for American cartoons; TMNT was great.