Overall - overrated trash.
Excellent cinematography.
I actually understand why so many people like it. People like discussing anything with "black holes", "time loop", when they have no clue what they actually are, in other words this show makes them feel smarter than the really are and so they "love" it.
Everything in this show is stretched out, secrets are kept from the audience just for the sake of secrets, this is not how a gripping story is produced.
First season was good, had a great plot twist too, but then this plot twist is repeated 20 times and story is extremely weak. 90% of season 3 is just useless/uninteresting.
Season 2 is just plain boring.