Even i'm having some issues with sharpness of the photos but it is with 70-300mm VR. I got 18-105mm VR as my kit lens which is working fine & i'm quite happy with it but 70-300mm VR, thats another story. In fact i have posted this very question in this forum some time ago. I think that there is some problem with D3200 which we have not been able to find out.
I hope that all the suggestions have made your photos sharper. Waiting for the response.