No worries
The problem with Black Mirror was the ending. I felt that the ending was rushed. It could have been a lot better if they would have developed it further and let the last fmv be longer and so on. But the ending itself (the story) wasen't bad, but it was rushed.
I don't have any negative word about Syberia. The only thing I can think of is that the game was split on two chapters (Syberia 1 and 2), so you had to pay for two games to finish one game. But it was worth all the money