Hi there
Looking at a site like this, http://dulfy.net/2012/09/08/gw2-templegod-karma-armor-sets/ , which gives an overview of the stats available at each different karma vendor (from clearing a temple), to me shows a misbalance in the stat distribution.
take something like heavy armor; looking at the available helmet options, there are 4(!!) vendors selling the same exact stat combination: Precision, Vitality and Healing. Why have 4 identical stat combination, and omit a big variety of combination, such as power, precision and toughness or strength, vitality and toughness?
Seems to me a bit of shakeup in the available stat combination from these karma vendors would not hurt the overall flexibility in the way to obtain certain stats on gear.