Far and away my favorite Sci-Fi TV show. I agree with another poster here, it's a character study of a normal-ish human losing his mind due to a continuous assault of The New. Poor guy can never catch a break.
Season 4 was a complete disaster unfortunately. While Scorpius is fantastic, he doesn't belong on the ship and that wasn't the only nonsensical thing happening by a long shot. I was very happy we got the peace keeper wars to give a solid end to the series, even if it wasn't perfect.
I agree, and so did the maker of the YouTube video I linked to. Interestingly, Wayne Pilgrim, the actor who plays Scorpius, mentions in an interview how difficult it was for him to play the character, since his motivation became, how shall I say, conflicted. It's an interesting case of the story-tellers putting an actor in a very tough spot.
EDIT: apparently Lt. Riker showed up in a DS9 episode[2]!
1 - https://en.wikipedia.org/wiki/Second_Chances_(Star_Trek:_The...
2 - https://en.wikipedia.org/wiki/Defiant_(Star_Trek:_Deep_Space...
Stargate: SG-1 had robot doubles who were killed off.
I liked that episode and would have enjoyed Thomas Riker showing up again from time to time. Although it was another one of those "why can't they just restore dead crew from the transporter beam?" episodes. Even worse than the Scotty one since doubling Riker means that Riker's matter didn't really matter much.
But the most telling thing IMO about Farscape was the dedication of the fans that actually pushed and got their conclusion in the Peacekeeper Wars. Contrast that with BSG where we basically got no resolution.
As a casual viewer, I didn't catch every episode in order, and so it was very confusing for me. No doubt it would have been a lot better if I had done. Not being able to follow the story-lines, I definitely started checking out at that point. Another commented mentioned that the whole series is being sold on iTunes for $20, perhaps it's worth a purchase and rewatch for this reason alone.
I had missed a few episodes that season, and picked back up after the two Chrichtons parted ways, but didn't manage pick up on the fact that there were two of them.
I was so utterly confused and upset when the main character just died and they cut straight to the credits.