First, let's get an important aspect clarified: a lot of reviewers have been (excessively) critical of the scientific veracity behind this show. Yes, they are right, this is not a model of how humanity will divert a ELE capable asteroid.
What this is trying be be is an engaging piece of entertainment that is (1) not a cop drama, (2) not a medical drama, (3) not a who's sleeping with who drama. It has taken a media-popular scenario - asteroid heading toward Earth - and wrapped it in a well presented package with charismatic cast and good pacing. It is absolutely light in scientific accuracy, but - I'm not sure how to put this clearly - IT'S A TV SHOW!!!
There are some interesting characterisations and scripting so far has been tight with only a few 'off pace' moments. Yes, a lot of characters are heavy on stereotype, certainly more than we get in UK shows - but, again, this is an entertainment show. I watch it for my brain to go into neutral and coast along; if I want accuracy, I'll watch Discovery.
As with all good sci-fi - the real story is nothing to do with the tech - it's all about the people and how they react to a situation. The asteroid is simply a McGuffin that puts a shiny angle on the show...
