Well seeing as this show was produced from 1984-1996 (although being born in 1991 i didn't see it until the 2000s on reruns) i daresay the main plot, character etc, are all well known, so down to the review.
All in all this is a good show. It is entertaining, has a catchy theme, a well made opening sequence, excellent incidental and accompanying music and a nice simple but effective spinning fade to next scene device which all work well to produce a well made show. The plots, although a trifle hard to believe, are not out of the usual in that a murder happens in each episode, at least in tv universes.
The characters are all well written and have good lines, and have interesting and varied personalities. The writing is good and the plots usually are interesting, varied and entertaining.
Overall smashing show.