Myopia as a microscopic superpower?
Short answer
Myopes may have some benefit in terms of identifying small objects due to their ability to focus objects nearer to their retina than emmetropes, but only marginally so.

Background
The more myopic you are, the more blurred your distance vision, but the closer up you can see clearly. Hence, myopes have a range of clear vision that is closer to their eyes than emmetropes (normally sighted people) (Triad Publishing).

A young emmetropic adult can focus at an object some 10 cm away, which is defined as an amplitude of accommodation (lens adjustment) of 10 diopters.

A severely myopic eye can be up to minus 6 diopters, bringing the tally from 10 to 16 diopters, meaning you can view something up to 6 cm instead of 10 cm.

Bringing objects closer increases retinal image size and hence increases spatial detail. Going from 10 to 6 cm increases the retinal angle by 10/6 = ~1.7 x, so not even a doubling of the angle. 

A random search for a magnifying glass for the visually impaired that aids in reading small print (newspapers etc.) yielded one that magnified 4x (16 diopters):


Clip on reading aid. Source: Eschenbach

Microscopes typically have lenses with magnification factors from 4x to 100x. 

So in all, myopes do not have microscopic superpowers. A standard magnifying glass for the visually impaired magnifies several times more than a severely myopic eye.