Haha you misunderstand. I'm not saying they didn't. They're absolutely amazing voice actors and they turned in their usual stellar performances. Heck wasn't Horikawa the voice director as well? I may be remembering wrong though.
But when I hear Japanese Dunban I can't help but hear a 17 year-old high school detective, not a 30 year-old war veteran. I can even say that Horikawa out-performed Jones in all regards - in the delivery of emotions, and definitely in the battle cry/yelling aspects (the less I have to hear of Jones doing battle cries the better) but ultimately, I prefer English Dunban's deeper tone of voice because to me, it just better fits my image for the character, even if he's not as great at the technical stuff as Horikawa.
As for Metal Face, like I said, I think Watson and Wakamoto were both great. Hell has Wakamoto ever been NOT great? But in the end, Watson was just a fresher experience for me and I think the nasally snide tone really fit his character.
So yeah I don't think we're disagreeing at all really. Unless you vastly preferred the Japanese for both those characters to the English, but that doesn't seem to be the case?