Just finished watching all 5 series of Falling Skies on Freevee (and didn't encounter one advert, strange). Not that bad, IMHO, and I quite enjoyed many parts of it. If it was a movie, though, it would certainly be a B-Movie! Series 1 through 3 were good, and got better and better as time went on. Series 4 took a major turn for the worst, going off on some weird tangent. Series 5 pulled things back on track, only to be let down with a rushed ending. Overall, I'd say it's worth a watch if you like human drama with a Sci-Fi backdrop, but it can get pretty bleak at times. I'd give it a solid 6 or 7 out of 10.