I really like this show. A lot. I love it because it incorporates a lot of stuff I like. It is a sci-fi show, but very earthy. It reminds me of Firefly in that respect, and in fact, "Wash" reminds me a lot of Zoe Washburne, for that matter.
Regardless, the family aspect really sets it apart for me, and gives it an emotional relevance. Something I can hold on to other than just concepts. That they make them relevant to the plot is even better. And I think they've handled it very well. I compare these teens' romantic interests with the ones from No Ordinary Family and I praise the Lord for his mercy and goodness. So not only is it a spiritual successor to Firefly, but Lost in Space as well.
I understand the complaints about having a case-of-the week format. I also look at the history of serial tv shows on television and it's pretty clear that unless you're JJ Abrams, or on premium cable TV, you simply will not gain success with a serial storyline. You can have a background thread, like the Sixers, but if they did go serial with this level of writing, the show would go the way of Fast Forward pretty danged quickly. Also, iirc, sci-fi works better with the case of the week format, yes?
I can understand the cliche complaints. The show is not top-level. It's just a decent sci-fi show. And if no one is interested in decent Sci-fi shows, why write a top-notch sci-fi show, when a top notch crime procedural will get both the discerning eye and the common viewer?