You is a psychological drama that feels politically correct. It follows the life of a serial killer and ex bookkeeper "Joe Goldberg".
Penn Badgley was casted as Joe which I think was a perfect casting decision. Badgley makes Joe seem Sinister and imperfect, which is exactly what makes the show so intriguing.
The way the show alters by Joe's thoughts is what keeps it so raw, if it was narrated from a third person perspective, I think the show would be boring but since we are in the eyes of a serial killer, we gain interest in it.
The show also has the correct amount of violence and narration. Action isn't always occurring, which is perfect due to suspense being key in a thriller like this.
The writing is also formed in a way which makes you sometimes side with Joe, which is why Joe is such an important and interesting character.
The show isn't perfect though, there's a lot of "cheesy" aspects to the show which make it seem unrealistic despite realism being the intention.
The directors make Joe seem like the sane one throughout the seasons, which especially with his role, is not what should happen.
A lot of the cast don't get as much air time as they deserve, which is a bummer since many of them are talented actors.