About two years ago, the conn officer was replaced by a holographic command module (HCM) as an experiment on my old PC ship. Suffice to say it worked for about two weeks before it went postal and tried to kill the captain after a programming glitch identified him as a hostile. Well after the managed to shut off the programme, the Captain had the software downloaded and then erased from the computer. Since then the PCs have not trusted ANY holographic crew including the EMH.
IMHO holographic crew are a okay plot device but shouldn't replace PCs permanently (I think Steve made that point in Spacedock that the EMH on Voyager may well be unique) even though they have much higher skills in their area of specialty than most PCs.
Arise, arise, Riders of Theoden!
Fell deed awake: fire and slaughter!
Spear shall be shaken, shields be splintered,
a sword-day, a red-day, ere the sun rises!
Ride now, ride now! Ride to Gondor!
Theoden King: The Return of the King