Shifting Tone Gives Diminishing Returns
These are my thoughts about this series as a whole, so there will be SPOILERS.
Season 1 was funny and creative. Its best moments are when it goes full crazy. The second episode with the skin suit gag (that sounds truly awful out of context...) is the perfect example of this. Gary is a fun protagonist because he's crazy. He's been isolated for so long that he's going insane. Elements that I love are his obsession with cookies, for instance, or the series' constant use of his pouty-lip face. He thinks of himself as an '80s action hero and he's wrong, and that's great.
The sci-fi elements are well used throughout and concepts like final space are interesting. Prison ships, telekinetic aliens - there's a lot to enjoy here. As the series winds on, more strangeness is always welcome.
The best elements on the show continue to be the weird stuff. Clarence's romance with the squid queen, for instance, is a second season highlight.
But I can't love the show because it keeps dropping its weirdness and comedy for pathos. By the end of season three, everything seems to be melodramatic, overly serious moments. The main cast are constantly saying "Big, Meaningful Things" to each other. They're always having "Big Moments," and it becomes tedious fast. Throughout seasons 2 and 3, these moments become too plentiful to maintain the silly tone. It's all payoff with no setup. What I mean is that every scene is played like the climax of a whole show but they're coming two or three times and episode. Not season: episode. It's too much, it's too overly dramatic, and it doesn't work.
The biggest pluses: the wackiness of season one (and dwindling throughout the remaining seasons), Clarence in season 2, the monster designs (the Titans and Invictus are extremely weird and wild looking), the sci-fi concepts throughout the show, Tribore (although he kinda peaks in season 2 and then it's just more of the same).
The drawbacks: the tone shifting from comedy to overly dramatic, unearned moments, tonal inconsistency as the show goes on, trying to make Gary and the others have touching moments, and several times that premises don't really get fulfilled. To that last point: it's things like Bolo's fight with the Lord Commander that's just over before it starts, or the awakening Titan and KVN Net where they spend a whole episode starting up the KVN Net only for it to do absolutely nothing and have no effect on the storyline. Not a great use of Chekov's gun.
It's enjoyable enough, and provides some good laughs at first, but as it goes on, it starts limping around, getting lost in an ever-more convoluted story and giving all of its best funny stuff to side characters.