Season Three lost momentum
I really enjoyed season one and two of the show and eagerly looked forward to the final season. While I couldn't stop watching the first two seasons, I found the third season to be a bit tedious. The show was disjointed in that the kids were on one planet and the parents were off on another planet. Don West became comic relief and he wasn't really that funny. Dr. Smith was a reformed villain who was so nice that she was boring. It also seemed like the kids were the heroes more often than the adults. The cute kid from season one and two had a HUGE growth spurt so he was now as tall as his dad.
This season lacked a strong villain since the robot was the villain. My problem is that the bad robot isn't that different than the good robot. The robot did have some subtitles but the robot couldn't every fully articulate his plan to destroy the universe and that's an important role for every villain in a film or show.
While the visuals were solid, it does appear that they changed directors too often. Some of the directors would zoom in on certain shots and go for a more artistic view while the others had their own style. The continuity of the show is disrupted when different directors take a different approach with each episode.
I still enjoyed the series overall but the last season was a letdown.