I just finished watching it, on your recommendations.
Not sure I want to watch the whole thing through again. It might be somewhat instructive to rewatch the first episode or two.
Much less closure/explanation than we get in most series' first seasons. I still don't understand what was really going on and I don't think a rewatch would provide answers, though it might clarify the questions.
MAJOR SPOILERS BELOW!!! DO NOT READ ON IF YOU HAVE NOT WATCHED MR ROBOT SEASON 1 EPISODE 8!!!!
If not watching the whole thing again, I recommend taking a look at the "easter eggs" they put out:
http://www.usanetwork.com/mrrobot/timeline-gallery/mr-robot-season-1-easter-eggs
The writing is dense and meticulous. The first time I watched the episodes, there were numerous scenes and dialogues that provoked a reaction of "huh?" in me. Things do not make sense. Is it sloppy writing? Has the writer forgotten what he just wrote? On second viewing, it slowly revealed that everything is meticulously mapped out and nothing is accidental. For example, in the opening scene of episode 3, Elliot's voiceover expressed surprise in seeing the two women in his hospital room, yet both women said, in essence, that he requested the hospital to contact them. I was so annoyed when I first saw this scene, and only later realized that the writer meant to drop a hint for Mr. Robot to take over his consciousness without Elliot's knowledge. He has these episodes of losing time, which becomes important in episode 10.
I felt compelled to rewatch all episodes for several issues, including how Sam Esmail visually managed scenes in which Elliot (Malek) and Mr. Robot (Slater) were together. People around them respond to one or the other, but not both. In most of these scenes, they both speak, but only one is speaking out loud and get responses and reactions from others. It's a delicate and meticulous dance. Only through observing these scenes closely can I tell which dialogues are spoken to the outside and which dialogues are internal. We know this person has dissociative personality disorder. The personality (and viewpoint character) known as "Elliot" has some but not complete access to his other personality known as "Mr. Robot." There are many subtle cues going on without exposition and can only be discovered through close viewing that turned out to be pleasurable and surprising to me.
In the first episodes, Elliot as we see him appears to be a very benign person who refused to kill anybody or directly harm innocent bystanders. At places I thought that was too much of a trope. But once it's revealed that Elliot and the obnoxious and callous Mr. Robot are the same person, this character as a whole immediately takes on a different color. He is in fact quite capable of ruthless behaviors. Is he a good guy in the conventional sense. Not any more.
One of the themes of the series is self-deception, or the unreliability of our perception of self, others, and the world. Only upon second (and third) viewing have I been able to (incompletely) distinguish the subjective and unreliable narrative in Elliot's head (eg, everyone says "Evil Corp") and the objective reality outside his head. In a roundabout way, Esmail is illustrating universal psychological mechanisms of reality and perception. What we hold to be solid, unshakable truth is often a belief and a fantasy. It's how the mind works even for people without any psychiatric disorders.
Another major theme of the series, which is buried even deeper, is how people relate to each other now in our Internet-dominant culture. The conditions are ripe for people like Elliot who can only form uni-directional connection with others, in which he can access their lives via hacking, while others hit a wall of lies and evasion around him. This setup insulates him from the risk and pain of real relationships; it also imprisons him. The Internet allows us to fake normal and fake happiness, easier than ever. I have never seen any movie or TV series that "gets it" so well. It gets how our lives have been subtly but deeply altered by technology.