Definitely the best American TV series of the year (so far). The acting, setting, editing, soundtrack, story, lines...all are simply impeccable. Everything feels intact.
The director is really skilled at steering the rhythm of the whole story: he takes his time building on the characters and the suffocating LUMON world at the beginning, but as more secrets unfold, the storyline is heated up with the innie-outie transition taking place more frequently. It all leads to the final meeting of the protagonist's working personality and his/ her real personality in the last episode. In fact, one of the core messages that this drama tries to get across is you cannot really sever your working self from your real life. Despite the fact that I felt a bit dizzy at first, I was totally mesmerized throughout the last five episodes.
I guess the story is not new (memories of similar sci-fi plots have been flashing by in my mind), but the exquisite storytelling is sure worth the unreserved applause.