Just binge watched this. I was really intrigued the first three seasons as I usually don't get into sci-fi shows, but I wanted to find out the real purpose. By the time I hit season 4 I got bored because it seemed to jump the rails with silly story lines like being in a game of a building attacking them. So bottom line was that while I enjoyed most of it, the premise of the purpose of them arriving was confusing and with everything leading up to the point, it was lackluster for me at the end. After reading some reviews I have to agree that the battle of good and evil with free will was the point? It's worth the watch.