Enjoyable. Neither know nor care anything about the video games, if you do, that probably puts you in an entirely different category. Of course it would be easy to nitpick the science and logic, but few if any fantasy/sci-fi/horror shows I've ever seen really hold water when it comes to logic- either you 'suspend your disbelief' and just go with it, or don't (or kinda do and just laugh at the 'science' now and then).
I had no problems with the two sisters in either timeline, but esp enjoyed: Lance Reddick- he probably had fun with his character's twist, and Paola Nuñez- was great, esp as her character's villainous side came out more-- I could see her as a Joker..