While I do agree that the Syberias were Sokal's best works, I also really enjoyed Paradise and Sinking Island. Particularly Paradise, but then I had a strong fondness for the leopard companion. Give me any kind of cat companion in a game, and I'm sold.
I thought both games had intriguing stories, beautiful graphics, and in the case of Sinking Island, very original puzzles. SI actually reminded me quite a bit of a modern version of The Colonel's Bequest, one of my favorite games from the EGA era.
I found both games strong enough to be included in my yearly recommendations, but of course, tastes differ.
As for Syberia 3, I will hold out for further information before I get too excited about it. I agree that Syberia 2 ended perfectly, and I don't feel that I personally need a sequel. If the story looks interesting enough, I will probably pick it up. However, if it turns into some kind of hybrid multi-player game, I will most likely skip it.