That sounds really ignorant of the great acting in the English side of things. The Japanese seiyuu are by no means infallible. Just because it's the original language doesn't mean that the voices are good. There are plenty of horrible seiyuu out there and there are plenty of series (Samurai Champloo, Cowboy Bebop, Fruit's Basket, Full Metal Alchemist, Blood + to name a few) that I think are way above their Japanese counterparts.
I thought we were at a point in the anime fandom where we could actually take an objective look at acting and not just base our opinions on what came first or what we think has more energy and emotion based on a language that most people can't even muster five words out of.
Luffy, Usopp, and Sanji all sound horrible in the 4Kids One Piece dub. In FUNimation's dub, Luffy and Usopp still sound bad, but joining them in the ranks of irritating voices are Zoro, Nami, and Buggy. Sanji sounds all right in the FUNimation dub, though.
Pharaoh Atem/Yami no Yuugi from Yu-Gi-Oh! sounds terrible in the dub. I also was not fond of Mai's voice in the dubbed version of the Doma saga. She sounded like a middle aged prostitute.
In PUSA's Pokemon dub, I hate all of the voices that I have heard save for Gary's and Professor Oak's. Of all of them, I would say the worst of the bunch are Ash's, James', and Meowth's.
Additionally, Usagi/Serena's voice in the dubbed version of Sailor Moon has always made my ears bleed.
On that note, Yami Yugi in the English dub sounds like a forty-year-old man. o_o
Well the worst one I have to say was Sanji from the 4Kids dub One Piece. :3
There are only two English voices I can't stand: Hinata Hyuuga from Naruto and Yuki Sohma from Fruits Basket ._.
Hinata is whiny and annoying ;;
Yuki sounds demented...
In their defense, Hinata was already whiny and annoying in the original Japanese; Stephanie Sheh was just trying to emulate Nana Mizuki's example there. Also, Yuki Sohma was voiced by a female in the original Japanese, which in and of itself is a rather demented casting choice on their part considering the fact that he's supposedly an adolescent male; Eric Vale was several steps up from the original seiyuu in terms of general quality.And, to make this post relevant... I don't like Ryuk from Death Note's English voice. I read the manga first, and imagined him more scary sounding.