If I'm not mistaken, Tracy Torme originally wanted the Kromaggs to return to the show in season three. Their first appearance was supposed to be the season 2 cliffhanger, but the inept schedulers at Fox at the time ran it out of sequence. By the time season 3 came around, Fox implemented so many chances to it that Torme left in disgust after his final episode was written, The Guardian. He later returned to season 4 as a "Creative Consultant", but had mostly moved on from the series. I wonder what his version of the Kromagg storyline would have been, had he been able to do it his way on Fox.
The first 2 seasons were definitely the best of them all. But I do consider season 4 to be a strong runner up to them. Season 3 was so dumbed down, it just destroyed it for me. In fact, one thing I liked about Season 4 was that they turned the character of Maggie into someone actually likeable, instead of the heartless 1-dimensional military bitch she was in seasin 3.
In season 3, they repeatedly re-wrote their own rules and continuity. Arturo talking about how humans naturally, scientifically evolve throughout history, and then talking about how it's natural for people to transform into dragons in season 3. And how it's impossible to slide into the future, yet the third season ends with Quinn and Maggie under the assumption that they slid into the future.
Season 4, they at least tried to being actual science fiction back to the show, and, in my opinion, succeeded on it most of the time. They also brought some humor back into the show as well, something that season 3 seemed to completely remove. Going from where they were left at Fox to what they had to dig through to rebuild on Scifi probably wasn't an easy task.
I remember Marc Scott Zicree used to host Q&A chats with fans on the Scifi Channel back in the late 90s, and mentioned once that he couldn't believe what a mess the show had become and how it was left at Fox for the new writers to come in and fix up, and I generally agree with him, so I cut them some slack.
Now, season 5 on the otherhand... by then, without Jerry on the show, and only really Cleavant left, they started losing me even more. Ironically, they cancelled the show based on the assumption that the ratings would go down once O'Connell left the show. They didn't, and remained the same for the entire 5th season. Scifi would have picked it up for a 6th season, bit they blew all their money on a 3-year deal for First Wave... a show that brought in a mere fraction of what Sliders did.
*shrug*