There's a lack of good sci-fi series currently and this is one of the better ones despite all its flaws.

Season 1 Pros: Judy, Will, Robot Cons: soundtrack, the adults, especially the parents and Dr. Smith

Most of the adults in Season 1 were aholes. A lot of the decisions and things they do leaves you wondering WHY? The mom is arrogant and the dad is completely useless. How did he pass the tests to get on the ship? Dr. Smith is annoyingly in your face all the time. And just as annoying and distracting is the cinematic music that plays EVERY 5 Minutes, it was totally unnecessary and excessive.

In Season 2, the kids are still doing good, Mr. Robinson becomes a little more useful but Mrs. Robinson becomes a bigger ahole. She regards her kids by their abilities and she's too busy to even bother reading her daughter's book. The excessive cinematic music has toned down some and Dr. Smith is less annoying. The plot is getting good and I'm rooting for their general success. This was the best season.

Season 3 was too dark. Literally a lot of the scenes were in almost complete darkness. Half the time you have no idea what's really going on. All the illogical things that were in seasons 1 and 2, becomes more ridiculous in the last season. But you also see growth in the kids and some of the adults. I would've like to see more of the futuristic world in Alpha Centauri, but unfortunately the show ended before we can discover all those interesting new places where Will and Robot are visiting.