Syberia II is almost identical to its predecessor, but it simply isn't as fun. There's more backtracking and hangups on this journey that it would be unlikely for any player not to get frustrated. The train ride is literally stop-and-go the whole way through, and Oscar will become a pain, as endearing as he is.
Where the game really fails is in its ending. Yes, we help an old man reach his dream, but Kate Walker gets no literally nothing for helping him. As she sees him happy in his utopia, the sudden realization of actually having to face the things Kate has deferred for the entire story probably hits her. The conclusion simply does not match the rest of the game.