alexp5's photo shows that the silver particles are very large. Even according to the referenced paper, the particles are over 40nm, which is 3 times what we want.
Most of these 'green' synthesis papers are just to get grant money. After all, you can't get much more green than using sugars.
Some of them have interesting studies of their affects on pathogens in-vitro, but unless studies are done which proves a difference when used in-vivo, then there is nothing to talk about.