Not all companies butcher their anime... One Piece was dubbed by 4Kids, I believe, and they censored things. I don't know about the show, but there was something about a character who had died in an accident... and they changed it to her being impared for life and will never be seen again..... Or somethng like that. I don't know enough about the series to go into any more detail. I don't even know what it is about...
But other companies aren't so bad. Dragonball Z and GT are the only things Funimation has butchered, and that was mostly replacing the music with generic rock and rap and giving minor characters good voices when major ones get stupid voices...
Everything else is they've dubbed has been pretty decent. And they don't hold back on death and killing like most American cartoons and 4Kids do. (Ironically, I think Pokemon is probably the most maturely done dub from 4Kids)