Without specifically spoiling the "twist" ending.
What is the worst possible ending to any show? Everyone dying? No. Everyone living? No. What if, without any warning whatsoever, the entire show preceding the ending ceased to matter whatsoever? No clues or hints beyond a couple of strange things... No clever flashbacks at the end to explain what really happened, no.... Just complete invalidation.
What messages is this show even trying to portray? The characters were dull, the story was dull, and the only interesting possibilities were basically a joke for the punchline that is E6.
While S1 and S2 are not particularly good, they were interesting and had potential. S3 is boring, with unlikable characters, flip flop motivations and finally, a slap in the audiences face. Thanks for wasting our time.