Jesper Juhl wrote:

Interresting. Just be careful results are produced for the big picture
and not used to point fingers at individuals.
  

If there are individuals at whom a finger needs to be pointed, this
system will highlight them, and fingers will (and should) be pointed. 
Contributors of poor-quality code need to be weeded-out. 
Finger-pointing, in these extreme cases, gives incentive to improve
quality.  It's a positive thing.