I had a really tough time trying to kill people while they were on vehicles, specifically the Intercepter. I also went around and watched gameplay videos from the Alpha and IGN's new beta videos, people were having a hard time as well. I went on rampages while I was jetting around on vehicles, so I can see this issue from both sides. I just felt like it was unbalanced and I hope it has been or will be dealt with before launch.
If for some insane reason you didn't have this same experience and you felt like it was balanced, maybe watch this short clip from the Youtube user DattoDoesDestiny, who definitely knows his stuff. http://youtu.be/IzVc2JxQbIU?t=4m48s
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Pack a Fusion gun. Get into a turret. use your super. Or the secret weapon that most don't use. Retreat, and don't engage until you ready. I handled VS very easily, to the point I used my sparrow as my primary mode of transport.
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Seems balancing factors are turrets, powers, and sniper riffles