I gave up in season 1. I'm not a big fan of non-linear story telling. Same reason I could never get into Lost. I enjoyed the parts around the plane crash and survival stuff, but the present day parts felt like a slog. I gave up on the episode where they went looking for a guy and found him dead. That whole part just drug on and on for like half the episode's runtime, and I knew he was going to be dead in like the first 5 minutes. I didn't hate it, just didn't feel like it was worth my time. I might give it another chance one day.