I started watching Siberia because I was familiar with one of the cast members (Esther). The concept got me interested immediately. The first few episodes are very reminiscent of "Survivor" mixed with "Lost". It amazes me how so many people think that this is a "real" reality show but is "fake" because it's not filmed in Siberia. This is not a "reality show", this is a show that has part of it's plot set up as a reality show.
The episodes just keep getting better and better, I find myself very attached to the characters and I love the character development as the show progresses. The acting, in my opinion is great, shout outs to Sabina, Esther, Miljan and Johnny. You have to remember that they are playing normal, everyday people and it's meant to look like a "reality" show. Also, note that the actors are not given scripts, to make their interactions look genuine, real and natural, they are just informed about their character's personalities and of course, the plot.
Speaking of the plot, this is the final selling point for me. This has got to be the most interesting plot I've seen in a while. Nothing is predictable and I find myself on the edge of my seat every week.
If you want a great TV show that is entirely driven by it's plot and characters (which in my opinion, all TV shows should be driven by), and if you're at least a little open minded, you'll LOVE Siberia.