A tad off the question, but I will add that I use the "vibrato" tool (the one that looks like a triangle wave) a lot in conjunction with the pitch drift tool (that looks like a shallow sine wave).
If a note varies way off pitch, I use the drift tool to center it on the note as much as possible, and then use the vibrato tool to reduce the magnitude of the variance. Old stuff to you Melodyne pros, but a good trick for newbies.
Arguing aside, people's ears now expect dead-on pitch. On the other side, doubled and tripled parts can be fattened by using Melodyne in the other direction, or by correcting different amounts (or by moving a part as a whole up or down a few cents after it is corrected).