for me his genius lay in his ability to deliver completely corny comedy in an understated way. There's nothing frantic or in-your-face about it. A one-off.
Agreed, and how he manages to keep playing it straight whilst all kinds of carnage is happening around him. Frank Dreben was a fantastic character and Police Squad was hugely under-rated IMO.
A class act.
Bought the Police Squad series on DVD a few years back, cost about £3 - 4 if I remember correctly.