It took less than a week to watch the whole 3 seasons and here are my thoughts. As this is the last show period I do not consider any spoilers are here.
S1 .... great season, great cast, writing and editing.
S2 .... the heartbreak and trauma caused by the trial had some of the best traumatic performances by those who played Beth and Mark ... they both carried the show through this season. But ... really did feel it would have been better to go to another storyline ... was this really necessary ... but again the acting was amazing.
S3 .... this season is why it was not renewed. Watched it only for Beth and Mark's storyline and hoping they would have a future at some point. They were the draw not Ellie or Alex. Really disliked the whole storyline .... way way way too many people involved ... like trying to find a needle in a haystack.
Sad in a way it is over but then ... not really. Back to Shetand for me.