Google Glass and What Has Gone Wrong: You get one guess

The poor resolution becomes an even larger problem when one realizes he or she is viewing the image right in front of  their eyes. It is also extremely easly to see the screen pixels

It is also a fact that screen brightness is most often much too low in the majority of situations

The actual glass which sends an image into a person’s eye scratchs so easily that it is really not even worth taking it out of its case.

http://guardianlv.com/2014/04/google-glass-and-what-has-gone-wrong/