Once they get to Earth its over for me. I hate everything about it, they never should have gone back to Earth in the show. Of course I had other complaints about the show in general, even the seasons I really liked, but what made me drop the show in the middle of the fourth season was the Earth stuff. I had also hated the two previous fake out Earth episodes in the show, "A Human Reaction" and "Won't Get Fooled Again", and when it got to actual Earth I just couldn't stand it.
To this day I have literally no idea what happens to the characters after the Season 4 episode "Kansas", I don't know if anyone dies or if Scorpius ever gets defeated or what the "Peacekeeper Wars" actually are, I was just absolutely done with the show at that point.
The parts of the show I liked I still really like and am glad I watched, and I'll rewatch favorite episodes on occasion. I just treat the show like it got cancelled without an ending, its not like its the first Sci Fi show to have that happen.
Like I said it has a lot to love. It even has an episode that I consider one of the top 5 episodes of Sci Fi TV ever made, "The Way We Weren't". It also had some of the worst episodes of television that I've watched, and a couple of side characters that made me long for the days where I thought that Wesley Crusher was the most annoying TV character. So to me it was a mixed bag, the show has very high heights but also rock bottom lows.