So... Merlwyb will be voiced

[Duelle]

The reason for that imho is largely because in Japan, anime is not seen as something solely "for kids" and also no opinion that "kids won't notice anyway" if the voice acting is bad. Not to say all non-Japanese voice acting is bad. The majority is though, especially for anime.

For me, it's also the fact the voice actors often don't make any effort to pronounce foreign names properly.

I think that's less on the voice actors (though the lack of voice acting schools has not helped) and more on the sound directors. Then again, I expect all directors to be like Nabeshin in PuniPuni Poemi, where he hits them every time they get a line wrong and tells them to do it from the top. >.>