Hi, I'm Higurashi_K1 and my opinions may disagree with yours!
I mean, yeah, there are some good English dubs of anime (Cowboy Bebop, Ghost in the Shell, Baccano!, Dragon Ball Z) but the vast majority of it usually turns me off. Also, a lot of dubs seem to lose a lot in sound quality (I'm an audio whore, can't help it) so I tend to avoid them unless the English voice acting is amazing.
(Also, personal encounters with weeaboos and nutcase anime fans have also turn me away from English dubs, but that's another story that is filled with hatred and the such.)