I find the cliffhanger of Season 12 and Season 13 mark the decline of KL... lousy new characters, the murder of Linda (who was great to spice up plotlines), the Pierce storyline (so not Paige type), the importance of Claudia's Character which I find was not a smart move (not the best character to rejuvenate the show + the sex appeal of a rottweiler) and the killing of her own son (wayyyy to much... plus I found he could have made an interesting character).
Isn't there a time when you have started loosing a bit of interest for the show