The first season is a 5/5, a masterpiece. I got hooked from the first episode. It's a mix between 2012 (survival), Skyline (alien invasion), and war of the worlds where everyone is trying to help with what they can.
There's an invasion happening everywhere, amazing show.
Then the 2nd season is pure trash. No mo invasion, no more thriller or survival. We discover that 8-10 kids have super powers and one of them can "fight" aliens. It went for realistic survival against aliens to magical fantasy. Very bad.
It went from 5/5 for the first season to 1/5 with the 2nd one.
Watch only the first season and don't waste your time with the second one.