I also have noticed that most times that people around me refer PNAS articles is to point out gross problems. Also I've heard that PNAS is quite weary of publishing rebuttals of their own published articles. While this paragraph comes from my own (small sample) experience, the paragraph above depicts a serious, objective problem.
I don't trust PNAS.
PNAS - Information for Authors An Academy member may submit up to four of his or her own manuscripts for publication per year. Members must secure the comments of at least two qualified referees.
...instead of the more usual track whereby a manuscript is reviewed by 2 or 3 referees selected by the journal editor, who remain anonymous to the manuscript authors. You're clearly a dangerous pinko commie pragmatist.
