I can count on one hand the amount of times an enemy team has called a VSAT on me - and that holds true for whether I am partied up or running solo. Therefore, I can see how the balance issues with this can be so easily ignored by the majority of the community.
While I agree that the VSAT turns the game into easy mode (I use it - we all know how ridiculous it is), I honestly have not run across too many opponents that can put one up.
On the other side of things - once one person in my party calls up a VSAT, it pretty much guarantees our streaks will be up in the air for the remainder of the game or it guarantees a chain of VSATs.
In the end, no direct counter = no balance. As much as I love my VSAT, TC is right - it can get crazy.