I read and loved Fight Club, loved the movie, and love Mr Robot. Sam Esmail (Mr Robot creator) even says in interviews that Fight Club is his favorite movie, and certain threads, characters, etc are an homage to that. I mean, he even plays the same song ("Where is my Mind") during part of the "reveal" in Mr Robot. However, as other viewers have mentioned it wasn't really MEANT to be that big of a reveal. In fact, the /r/MrRobot subreddit had that theory nailed very early on in Season 1, and I would argue that knowing that reveal was coming didn't detract from any enjoyment.

Anyway, I totally get why you feel that way about the Fight Club similarities, and at first I felt that way too. But if that is the main reason you stopped watching, I urge you to give it another shot! I think there is so much more to the show than that story thread.

Edit: Also, just curious, how far did you make it before you decided to stop watching?