John Pleshette once made a very good point: just because they're your neighbors, that doesn't mean you're intimately involved with them. You might wave hi and bye to each other in passing, or share small talk across the hedge about the weather and so forth, but you don't ever really have much to do with your neighbors, and they hardly ever have much to do with you. I think that, more than any other factor, is what makes season one so uneven in terms of quality.
You can see almost immediately that David Jacobs and his staff are struggling with how to make the four couples interact in ways that make sense and carry some impact on the stories. Having Gary work for Sid at Knots Landing Motors is a smart way to have the Ewings and Fairgates interact, but what about the Averys and Wards? Richard's an attorney; Kenny's a record producer; Ginger and Laura are a kindergarten teacher and housewife, respectively. How do you bring them into stuff that's going on with the other two couples or at KLM without making it seem like you're shoehorning them in?
You can also see right away that some couples are just easier or more interesting to write for than others. Gary and Val are good for stories, because of their past history, as established on DALLAS (even if the episodes where J.R., Lucy and Kristin visit are among the show's very worst, lol). Richard and Laura are also good for stories, because they are the quintessential middle-class couple that's disintegrating under the weight of the husband's ambitions. They personify Jacobs' vision for a Bergman-esque marital drama better than anyone else on this show. Karen and Sid are a bit harder to write for, because Karen is so loud and shrill compared to Sid, who often fades into the surroundings; but, as the older, anchor couple, they lend to KNOTS a gravitas and stability that Gary/Val and Richard/Laura can't.
The hardest couple to write for, therefore, are Kenny and Ginger. Not only are Jim Houghton and Kim Lankford unevenly matched, IMO, but there's just nothing about the Wards that's interesting or sets them apart from the others on Seaview Circle. I think this is because Gary and Val's presence in the cul-de-sac makes Kenny and Ginger redundant. You can't tell any good "young couple" stories with Kenny and Ginger, because Gary and Val, as spinoff characters, have that covered. And while you can tell stories about the lengths Kenny will go to to be a major player in the record industry, they're gonna feel awfully similar to stories about Richard doing whatever it takes - even pimping women! - to pull himself and his family out of middle-class mediocrity. So, what is left for the Wards to do? That's why, when they leave after season four, you don't miss them. (In retrospect, I think making either Kenny or Ginger black, thereby allowing for opportunities to explore the issues that an interracial couple living in Southern California in the late '70's and early '80's would face, would have been a good way to avoid this problem, even if it would have been way ahead of its' time, lol.)
I look at season two (and, to a certain extent, season four) as what could happen when you let Aaron Spelling or his sensibility run a non-Spelling show. Nothing that happens is properly motivated; characters are too venal, and emotions are too big. (I still laugh whenever I think of drunk Gary pounding on the glass and yelling to Abby that they are "RUINING LIVES!!!!," lol.)
Again, Ciji's body washing up the shore is probably the moment when the "new" KL rises from the ashes of the "old." It's hard to explain, but you just feel like that's the moment when the show has finally figured out what it wants to be and how it wants to get there.