I was really blown away by the voice when I first heard it... but as time went by, it started to sound like someone was reading from a book... I can't explain

I was really blown away by the voice when I first heard it... but as time went by, it started to sound like someone was reading from a book... I can't explain it precisely, but there's a lack of "personality", made more apparent when switching from a human voice. Very impressive stuff still.