I have to admit to liking this show better when Charlie Schlatter was on it. No offense to Scott Baio, but the series didn't seem to click with him. While his acting was fine, I don't think the material suited the show (his past on the street didn't seem to work).
When Charlie joined they turned the show away from the streets and made it more what it was supposed to be: doctors solving crimes. Perhaps it was the type of crimes that changed as well. And it worked with the type of characters depicted on the show.
I can watch this again and again. The characters are very likeable and the plots are easy and fun to watch. I'm glad it's coming out on DVD.