You know, it is terribly easy to blame vibrato as the culprit for poor musicianship, when the latter is really the problem. To use a choral palate which is completely devoid of vibrato is like painting only in black and white: skilled technicians know how to use EVERY color of their voices to the fullest extent in a choral setting.

Vibrato is not a bad thing, poor tuning and no control over vibrato is.