As someone else described (in paraphrase) starts off well then gets stupid. Over use of flashback and delusional thinking to depict an unreliable narrator. It has so many characters "flashing back" to moments that didn't happen, it's hard to tell them from the flashbacks/events that did. I don't know if the makers had to meet a minimum episode requirement, but the use of repeated scenes and the utter stupidity of some of the exchanges seem like filler.
There are a few other noticeable flaws in writing. "Are you married?" (asked while the woman is wearing a bridal set with a huge diamond.) And the final pool scene - WTF happened there?!?!?
My bigger peeve with the story is the depiction of - for the vast majority of the story - otherwise intelligent, accomplished women as becoming stupid after a good f*%&$k. On the other hand, the story closes out pondering that plot point, so, much like with the flashbacks, it feels like you - the viewer - were punk'd. I'm not sure if that's good or bad.
Reminds me a bit of those B horror films that are so bad, they're good. The makers knew this and are laughing all the way to the bank. Which is why it gets an 7 instead of 5.
Overall, the mystery is gripping enough to make one want to hang around to see whodunit and why. But the urge to do something else while watching or fast forwarding is overwhelming.
Oh, and that whodunit. Who = resolved. Well, at least one of them. Why = not so much - for all of them. Which sets the stage for season 2.