I felt the show was really good until about Episode 8 or so.
Then... it jumped the shark for me and got into Lost territory... but not in a good way.
My wife literally laughed hysterically and got up and walked out on the last episode. It took effort for me to finish.
Its a bit too wtf that just can't be explained in any meaningful way without resorting to the cliche halucination, time travel, etc bullshit.