The route of this problem is how animation and voice acting is perceived in American culture. Only in the last say, 5 to 10 years have people in both fields really seem to get some respect coming their way, and even then, it's like molasses in January. Cartoons are viewed as only for children, and voice actors are perceived as not being able to cut it as normal actors... ignoring the fact that most of them have to make emotion in their voice stronger so you can sense or hear it without actually seeing them. There's a lot of other issues with being a dub actor, such as fitting different text (due to language differences) in the same frames, make it sound natural, and still do all that other stuff that a voice actor always does.
A good way to gauge the voice acting field is by the Dynasty Warriors video games series. It was pretty bad, overall, for the first few games, and each one is progressively better as cast members come and go. (I'm not just saying this because I'm friends with one of the newer additions to team, either. He's just that good.) It helps they've started giving them the correct pronunciations of the names, too.
I'm ambivalent to the Case Closed dub, and I really enjoyed "Jimmy's" voice, but overall it was just in that time period where dubs were still super bad, (minus Bebop), due to the same few people doing all of the work, and I question their talent. Without it, I don't know when I would have ever discovered Detective Conan.
The problem with the YYH dub is that they changed sooooo much in the dialogue, it changed entire scenes. Someone mentioned to me a few weeks back that the voice actors went back and redubbed scenes for the BluRay because they were so off. I really liked their voices, and if one of my favorite actors was not in the original, (and without all the changes), I would have been perfectly content with it. Yusuke's voice was perfect.