Been watching a playthrough and...
OK, the English voice acting is really bad. I don't know what it's going to take for Americans to realise that English accents aren't easy to produce - only a handful of American VA's or actors have ever pulled it off right IMO. There are three choices that can rectify this in any media - 1. Let the character have an American accent, 2. Let an actual English person do the VO, 3. Find an American that actually knows what an English accent sounds like. This has been going on since the dawn of audiovisual media, and it has to stop.
They're all ridiculously bad at it, it's immersion killing. And that's just the accents. The actual acting part is kind of shoddy as well. Nintendo have really dropped the ball here.