No surprise, quality of the writing has been declining steadily since the first season. The original source material was only a hundred pages, the original ninety minute movie captured it. Drawing things out to ten, twenty, thirty, etc hours requires a lot of creativity but they mostly just rolled well worn tropes and hoped the visuals would make up the rest. In the end I was mostly watching for the theme song. I thought the last season was the final season since they managed to write in killing off all of humanity. I’m not sure how they would have come back from that but they probably would have ripped off either Dallas or Dr Who - maybe a dash of Wayward Pines sprinkled in.