Who were the best, worst, and decent replacements on DS, in your opinion?

Best
John Karlen as Willie Loomis (replacing James Hall) [1967]
David Ford as Sam Evans (replacing Mark Allen) [1966]
Thayer David as Matthew Morgan (replacing George Mitchell) [1966]

Decent
Vince O'Brien as George Patterson (replacing Dana Elcar) [1967, 1968]
Angus Cairns as George Patterson (replacing Vince O'Brien) [1967]
Diana Walker as Carolyn Stoddard (replacing Nancy Barrett) [1968]
Alfred Sandor as George Patterson (replacing Vince O'Brien) [1968]
Carolyn Groves as Victoria Winters Clark (replacing Betsy Durkin) [1969]
Edward Marshall as Harry Johnson (replacing Craig Slocum) [1969]

Horrible
Betsy Durkin as Victoria Winters Clark (replacing Alexandra Moltke) [1968]