I really hate them. Once again, Google have completely failed to consider multi-lingual people. Like Google search, even if you explicitly tell it what languages it should show results in, it's often wrong and only gives results in Russian when searching in Cyrillic, even for words that do not exist in Russian but do in the language defined in the settings.
Also the voice is pretty unemotional and nothing to do with the original voice. And it being a default that you can't even seem to disable...
Recently they added a setting for default language
Last night, I came across a video with a title in English and an "Autodubbed" tag. I assumed it would be dubbed into English (my language) from some other language. But it wasn't. It was in French, and clearly the creator's original voice. The automatic subtitles were also in French. I don't know what the "Autodubbed" tag meant, but clearly something wasn't working.
I am by no means fluent in French, but I speak it well enough to get by with the aid of the subtitles, so that was fine. In an ideal world, I'd have the original French audio with English subtitles, but that did not appear to be an option.