Does Raiders GM McKenzie have trouble judging QBs?

Daily Raiders blog for NBC Bay Area website: The Raiders appear to need a quarterback, but with Reggie McKenzie's recent track record as Oakland GM, can he be counted on to find a good one? http://www.nbcbayarea.com/news/sports/Raiders-Recent-History-with-QBs-a-Cause-for-Concern-236215101.html