I've only been able to catch the first episode today, with the other two still sitting in my DVR, but I'm already pleased with how this series is going.
I'd describe it as Fight Club with hackers instead of punching and bombs, or the TV equivalent of what Watch_Dogs could have been if it tried harder. The hero is Elliot, an awkward, delusional, possibly paranoid-schizophrenic introvert, who's a cyber security expert for a tech firm by day and a vigilante hacker by night (and who narrates the show in Fight Club-esque monotone). He gets caught up in a conflict between a secretive hacker group and the world's largest corporate conglomerate, and he has to help the former take down the latter with his expertise.
From what I can tell so far, it's actually a brilliant little show. All of the concepts have been done to death, but they're executed here in an intelligent light that makes them fit together in a fresh and compelling way. I love Rami Malek as Elliot, and I quite enjoy how the hacking is portrayed fairly realistically as opposed to the unstoppable cyber-magic every other show and film makes it out to be.
Let's just hope that it doesn't get cancelled like every other remotely intelligent show I get into.