That's a difficult question, because I think the show rebuilt itself several times. For me the best seasons were 3-7, and nothing is ever the same after Laura is killed off and Mack , Val, Gary, and Karen also become significantly more one-dimensional as characters. The show as a whole becomes more one-dimensional. They also start running into dangerous territory with Abby, but fortunately Donna Mills took care of that and left.
There are still good moments in that period, but it's a different show...still a show that I found watchable, and fortunately I was able to accept Paige (if I couldn't have I just would not have been able to make it as a viewer anymore). Some of the new characters, even if they are more typical '80s gloss and lack the depth of someone in the early years, keep me involved (Frank, Pat, Linda, Anne, Paige, even go-nowhere characters like Paula).
Aside from some pet peeves of mine (anything involving baby Meg, anything involving Olivia whining, anything involving DIRTY COP DIRTY COP DIRTY COP), I'm able to be involved in stories, even if I don't really like the stories very much for themselves. There are some fun interactions, sharp dialogue, etc. I think the show plugs along in that vein until around season 12, which is a much stronger year for me, maybe the best since season 7.
The season 12 finale and the whole feel of season 13 is just too much, too much for the show to ever recover from. I know a lot of people enjoy the back of 13. I might try it again someday, but I'm in no rush. 14 I sort of half-watched, and I'm not in much rush there either.