Stepping in to pull for the other side in this thread. Like others, I went in expecting a War of the Worlds type TV show, full of action and fighting the aliens but once I stopped expecting that, I saw the brilliance of this show.
This is far more likely how an alien invasion would go. Any species not evolved on this planet will be completely bizarre and unfamiliar to us – including how they'd go about taking over our planet. They wouldn't show up in ships pew pewing all over, killing us all until the last of us is gone. They'd exterminate us with bio technology that they could drop in ahead of their arrival and have them clean up by the time they get here.
Typical alien invasion stories assume that they'd engage in warfare like humanity has done when conquering foreign lands. They're not human and they're by the very nature of their being here, far more advanced than us.
This show is daring to think differently and take into account how bizarre an alien species would seem to us, at the cost of resisting easy popcorn entertainment. I believe that this show is going to develop over several seasons and the first act, was the extermination attempt. We haven't even seen the aliens, just the bio technology sent to eliminate us. The second act will have the aliens themselves arriving, unprepared for a planet with surviving humans, having to fight us head on – again, avoiding the conventional expectation of kinetic or heat weapons. They'll use mind control, other biological weapons or something we haven't even conceptionalized.
I look forward to a story about an alien invasion that makes us think and doesn't take the lazy way out.