VP is such a versatile tool.
Since it affects everything , ive been able to do pretty neat thing with it.
Ally about to die by consumed souls ?
VP them and they will be saved.
Pyro blast , precision strike , i mean the list is pretty big but VPing and ally can be really usefull.
VP enemies is more to set up kills.
But the best thing is it works on core.
What this means is , your your core is about to die , VP it . it may give you just enough time to save it.
Theres many game si did in hanamura or black hearts bay and it saved the team 
!
In short .
VP ally : to save
VP enemies : to set up kills
VP core : emergency button to buy time.
VP a camp : please dont do that unless you know exactly what your doing lol 