First off, the ending of this game is excellent, and completely in tone with the first two Syberia games. I can confidently say that it will satisfy older fans, once they see it.
With that being said, this game is a mixed bag, with a plot that would have been just a side episode in the original Syberia games, with mostly weak puzzles and underwhelming gameplay, dodgy voice acting (with the exception of Kate and Dana, both of whom are voiced excellently), and an amazing soundtrack as usual.
The game looks great, and I liked the overall vibe of Vaghen; I think it expands the setting of Syberia in a good way, showing how Hans' influence can be felt throughout the world. That being sad, it's a bit sad that Vaghen is basically the only location we spend the game in, not counting the mine from the prologue, and a lot of flashbacks showing different places.
Some of the puzzles were good, like the Musical Square one, but those are exceptions, and not the rule. I also cannot fathom why they didn't just call the "National Socialists" with the name they are known for, but rather used a made up name for them.
Still, all the shortcomings of this game are just wiped by how satisfying the ending was for me, and that makes me very happy. Even if we never get another Syberia game (and I hope will get more), I would be quite happy with how this one ended things.
I truly feel that Kate Walker is one of my all time favorite video game heroines, and I was happy to be a part of her journey.