Firstly, it is a tidy CLOSURE. It could have been better, but we were lucky to have something so NEAT, given how this show has gone.
It was one of those shows that made NO SENSE at all. However, the show garnered a cult following due to its CAPTIVATING central mystery. CURIOSITY sustained the show for four long seasons.
Back to the finale: It nicely wraps up (and sets up) the Mick-Zeke and Ramirez-Tamaki couples. Ben Stone gets back his family. Eagen turns a corner. Cal-man was a waste. The writers could have handled Angelina's story better. What was the point of her being punished by "God" if nothing happened?
Perhaps the showrunners chickened out and avoided a DARK ending. They set it up as an "end of the world story". The plane was supposed to be a modern-day Noah's ark with only the deserving passengers (and maybe a few other humans) destined to survive. However, there was no "end of the world". Instead, the passengers exit the terminal. But, then, that begs the question what was the purpose of Flight-828's disappearance in the first place? Also, no Captain Daly?
Anyways, enjoyable show. Wonderful characters. Hope to see Zeke, Mick, Ben, Olive, Sanvi, Ramirez, Drea, Eagen, etc, in more shows.
More shows should be made in this genre. However, one recurring problem with such shows is the inconsistent mythology. The writers often weave too many arcs around the central mystery. Many of which don't even make sense. But worse is the shabby unweaving. That disappoints the most. Hopefully, networks will take notice and fix this problem.