This show falls in the television equivalent of the "uncanny valley" - half-way between realism and fantasy, that achieves the allure of neither while realizing the flaws of both. If Falling Skies were more fantastical, say like Star Trek (pick your series or movie), I could suspend disbelieve and enjoy the magic of imagined futuristic technologies, however improbable they may be. On the other end of the spectrum, consider something like Gravity; I was willing to overlook the occasional stretch because it included such a uniquely-high dose of realism, forcing the characters to grapple with practical problems that other sci fi stories sweep under the rug.
Unfortunately, Falling Skies feels to me more like Jericho - a good premise with lots of potential, but too much perfect hair and convenient stashes of pre-apocalyptic supplies to distract me from the show's legitimate attempts to depict the hardships of life after an alien invasion. Stated another way, Falling Skies spends a lot of time - to their credit - trying to show what life might be like in the world they've created, yet repeatedly undermines those efforts by introducing new technology, incredible feats, and absurd coincidences on a continual basis. It's too real to be escapist, and too fanciful to be dramatic.
The above notwithstanding, I'm 2 episodes away from finishing the series. So, there's obviously something in Falling Skies that has kept me watching, lo these many hours. (That "something" is most likely the fact that my family was away on vacation for two weeks, and this show provided a suitable backdrop to reading the news on my phone while winding down at night; otherwise, I probably wouldn't have put in the time.) Based on the high star rating, I was expecting another Battlestar Galactica, Firefly, or even The Expanse. Sadly, Falling Skies misses that delicate and elusive balance of sci fi magic and human drama that compels me to watch the show on its merits. If you're looking to kill some time, and can tolerate a haphazard, cliche-ridden, shark-jumping plot, though, you could do worse.