The series started great and ended magnificently!
All major and minor character arcs were closed properly.
This is how a series with a great start should end.
Hats off to the captain for saving humanity in Season 3:
"It's a cruel world.
Maybe we do all deserve to die.
But maybe we could be better, too.
If you kill us all,
you end human cruelty, yes.
But you end human kindness, too.
No more jokes. No more gifts.
No more surprises.
Why would a man
with all your fantastic knowledge
not use it to teach people
how to be kind?"