I can't play the demo I watched the whole thing though and saw a few reviews and discussion videos on it, that's how I came to my current conclusions about the game. It seems to play, feel, sound and is animated like a game from a bygone era. While the graphics themselves are decent they are also dated by comparison with big budget modern titles.
I mean if you don't think the voice acting and recording is bad you should go A/B it with some newer games, the original Shenmue games are legendary for the bad voice acting and Shenmue 3 isn't much better.