This show was a show of realism, it captured something about the san fernando valley and at least what i perceived as realistic about the police there (having lived in that area). It showed the sharp contrast from life in the densely populated, gritty, harsh personality northeast (where i grew up), from the life in the suburban, wealthy, always sunny, windswept style, wide open, cheery yet serious, san fernando valley.
This is one of my favorite shows of all time and it always upsets me not only that the series ended, but that towards the end of the series it appeared the show veered from its manner and did stunts and the usual hollywood tricks to get ratings and save a show that seems headed to the chopping block.
One thing that bothered me about the series was that the character of marsh took the fall for the sexual harassment complaint (which i believe may have been part of the reason the show failed), when it seemed almost certain that he was the victim of an officer who knew she was about to get a justified bad review, seduced him and knew just when to kick him out of the house so that the regular police patrol would find him there - it may have made a nice episode for him to figure out that she set him up.
It seems a pity that such talented actors, especially David Keith in his element, Matt Craven and the rest, and writing and cinematography did not pan out into a long running fruitful series.