concept of after apocalypses community living in a closed spaces or surviving in the wild is nothing new, but i must say Silo got me hooked with season 1. And i went through season 2 as it was released.
I felt season 1 was a bit stronger but season 2 had a lot of those "answer" moments that we waited for after season 1 :D
And they did a good job with all of them.
I hope they don't stretch it out more then they should. And the final explanation will probably not be spectacular, but i do hope they keep the quality till the end.

Trying my best to not see any book spoilers :D

It can be compared with Fallout only by the initial concept of vaults. Fallout was always about all the weirdness in the outside world, and all the little weird and funny things. At least for me as a big fan of the games.