Graphene - the new kevlar?

A team of researchers working at Rice University in the U.S. has demonstrated that graphene is better able to withstand the impact of a bullet than either steel or Kevlar. In their paper published in the journal Science, the team describes how they set up a miniature firing range in their laboratory and used it to test the strength of graphene sheets.It has always been known that graphene sheets are tough and stronger than conventional materials like Steel. But we have only able to produce very small quantity of graphene. Thus, to check its strength as a armour the researcher either had to produce large amount of graphene or scale down the bullets. They did the late, that to at a very small scale.
They use a laser to vapourise gold particles which acted as the gunpowder and used micro bullets of the size of a few microns and fired in on 10-100 sheets of Graphene stacked as a mat.
The whole experiment was recorded in slow motion and the bullets travelled at a speed of 6750 mph.
 Graphene dissipated the energy just like a trampoline by stretching back, and absorbed 0.92MJ/kg as compared to 0.08MJ/kg for Steel.
This might prove that Graphene is better at the small scale but what about the defects and dislocations introduced as you increase in volume. All materials tend to weaken out when compared with their whiskers or samples at nano or micrometer sizes.