I've always thought it was a shame that "Doctor, Doctor" had such a short run, because it was, hands-down, one of the funniest sitcoms I have ever watched. Matt Frewer was a large part of what made this show so wildly hilarious; I don't know how much of his dialogue was written and how much was improvised, but it all sounded as though it flew effortlessly from his lips. The cast members all played off one another quite well--it wasn't just a one-man show--but it was Frewer who gave the show its special oomph.
"Doctor, Doctor" also dealt with a gay character better than almost any other show: Richard's sexuality was simply a given and not made into a "problem" to be handled with kid gloves. In this the show took a more mature approach to the subject than most shows have, for which the show's creators deserve applause.
"Doctor, Doctor" was undeservedly short-lived, but it will always be remembered by me as a wonderful comic gem.