Your success - or lack of - regarding V-Vocal depends entirely on how you use it.
If you take care with your original recordings and your system is optimised then there is absolutely no reason why V-Vocal cannot be used to tune vocals.
It's when you take it outside of it's comfort zone that phasing/artefacts rear their head, and in cases like this, you should really consider re-recording rather than trying to polish a turd.
I've used it extensively on many a lead vocal, and I don't get phasing or artefacts.
In the right hands and with thr necessary care taken it IS a GREAT tool
CJ - I'm surprised at you - you used to champion the merits of V-Vocal - what happened to make you change your view?