The Ending
So the Elliot we've been following turns about to be a different "personality" of the real Elliot that has taken the reins. Fair enough. The goal was apparently to protect Elliot from the evils of the world and that's why he started F Society. My problem with that is at the beginning we see that Mr. Robot is the one who started F Society and is pushing the plan the whole way. Vigilante Elliot is either out of the loop or struggling against him most of the time. By the end Mr. Robot is now this protector yet he was the one constantly pushing Elliot into danger. He even tells Tyrell to shoot him if he tries to stop the plans.
I feel like the ending is a concept that the writers came up with after they had already done all of these early twists.