(At the time I'm writing this, three seasons have aired and a fourth one is confirmed.)
As an enthusiast for space flight, For All Mankind is an obvious fit for me. The first season with its far-extended Space Race, with Wernher von Braun, the Saturn V, and the Apollo program, was very special to see. Admittedly, it took the series a few episodes to properly take off, but when it finally did, it delivered fantastic characters, an interestig plot, a furious finale, and -- most of all -- perfectly legitimate and realistic depictions of space flight.
The second season continued in a similar vein. Character plot lines continued, the space race continued, the politics continued. The space flight kept its level of realism, though it progressed far beyond what was actually possible with our circumstances.
The third season I felt devolved into too much soap opera. Character-driven plot lines have always been a firm and important part of For All Mankind, but in the third season they began to eclipse the space stuff. There is one episode in particular which could and should have been about strange new worlds but instead spent three quarters of the time on a character being gay and the last quarter on astronauts being absolutely unprofessional. (Both themes actually occur frequently throughout the entire series, but they're typically only part of the narrative, not its entire focus to the detriment of the space stuff.)
Nevertheless, the third season delivered a nice finale as well, and I'm eager to see what is going to happen in season four (and hopefully in future seasons as well).
Apart from the soap opera extending its reach, I also have to criticise a certain naiveté. The universe of For All Mankind in many ways feels much more favourable than our reality, and while at many times that feels perfectly reasonable, at others it is a bit overdone.
What impressed me quite a lot, however, is how well the series manages to span the many decades. Starting in '69, the third season is set in the nineties, with the final scene announcing the fourth season to be in 2003. We see the characters age (and, in quite many cases, die), see their children grow up, and that actually works incredibly well.
And, of course, the realistic and genuinely reasonable space stuff is just fantastic!
