Okay, after watching the first few episodes, I can form a solid opinion on it. First the voices.
Yusei is voiced by Frank Frankson. A decently good voice. Nothing to complain about.
Jack Atlas is voiced by Ted Lewis. He's using an Australian/British accent, which maybe too much, but I don't mind.
Trudge is voiced by no other than Dan Green. He uses a gruff voice that sounds like Atem is mad at something. Okay with it.
Goodwin was voiced by Maddie Baulstien. A good voice, sounds sinister. Lets hope his second voice will be good as Maddie's.
Leo is voiced by Amanda brown (or so I heard). Sounds childish, but it will work.
Luna is voiced by Kether Donahue (again, so I heard). Same with Leo.
I'll reserve my comments for Akiza when she properly debuts, but she is voiced by Bella Hudson (and again, so I heard).
Next, the script. Despite the odd ad-ins (Yusei knowing Trudge, being afraid of bugs, getting amnesia...), the edits, and the card explaining computer, I think it's translated pretty well. I wonder how will they handle season two.
Finally, the music. Since I don't watch subs, I think the music is fine. As for the opening, I think it's decent.
Well, those are my thoughts on the series. It may or may not be 4Kids' best dubbed anime, but I think it will turn out fine. What are your thoughts?