Personally, I never loved them as many people do. I did like them, but that was it. I've never been so much into mechanical puzzles either, eventhough in this case, these mechanical puzzles blended in with the story and were justified.
The game had very unique atmosphere and story though. I'd give both Syberias 3 out of 5 stars if I was to review them, and that in my book is usually very much worth playing the game.