Well, for me it's a mixed bag.
On one hand, I have a reputation for being a snobby veterin watcher (16 years of anime) & we snobby anime veterins concider mainstream anime & dubs to be "noob magnets," & everyone knows that old fans of anything have little tollerence for inexpenced newcomers into a fandom. I also have a deep-rooted resentment for Funimation & 4Kids; which slam-dunked Manga Corps on dreadfullness when they set up shop. A lot of us oldschool fans have also noticed how popular dreadfully mediocre series have become, simply because they're available on cable in English. We take this as "noobs have poor taste."
My more polite & decent half is simply sick of 16 years of inacurate translations, ill-fitting voices, & bad voice acting. I also think male Japanese voices are just sexier. Not all dubs suck though; Excel Saga, Gensoumaden Saiyuki, Slayers, Slayers Next, Slayers Try, the first 2 OAVs for Heroic Legend Arslan, Cowboy Bebop, Trigun, etc. & sometimes the innacurate translations can actually improve the humor in a comedy when done right (Special Duty Combat Unit Shinesman).
There are also just a lot of really dreadful dubs like Yu-Gi-Oh, Ghost Stories, Lost Universe, & Juubei-Chan, that should never ever be watched in english.