I'm sure you know the actress who plays Sackler is Ahmad Rashad and Phylicia Rashad's (Claire Huxtable) daughter.
I have not watched Ray Donovan or Shameless, the most watched Showtime shows. I didn't catch either of them when they started and I never had the urge to catch up. My wife did binge Shameless but I never did.
I started watching Showtime in very early 2018 with The Chi and Our Cartoon President starting at nearly the exact same time. I started seeing Billions promos and a couple of the sports podcasts I listen to talked about it all the time, so I decided to try to binge seasons 1 & 2 on a trip to the UK that I took in January of 2018, season 3 started in March of 2018 when season 1 of The Chi wrapped up. From January 2018 on, I watched nearly everything that Showtime has done because I like it all. The most notable thing that they've started since then that I didn't watch was the reboot of The L Word.
I can't even decide what my favorite Showtime series has been, they've been on a hell of a streak. Honestly, I think Your Honor has been my least favorite Showtime series, but I still liked it at least a little and I'll be there for season 2.
I used to be an HBO guy but they've really leaned hard into the fantasy/sci Fi genre and that's not for me. Showtime does almost none of those, just very well made dramas, comedies (not enough of these), and docs. I feel about Showtime like most people feel about Netflix.