with more effects like tank stun, crew blind, etc. or something.
I like the idea, stunning might also ensure that if one of the shots hits the second and third one after that will hit as well.
Also another way to reintroduce some of the currently unused vehicle criticals.
If its worthwile (for its cost) against tanks you might tone down the anti-infantry effectiveness even more.
However, Relic already rebalanced this ability...I dont think they will do that again
http://www.youtube.com/watch?v=cU6OK1zSxKg