Actually, a pretty well written article. But the article itself mentioned some of the flaws in this argument. While I don't want to go into a whole rant, I'll touch on a couple things:
1. Most of the losses in the 3-18 record come from either bad team play, or a little bit of bad "luck". It is hard to pin too many of those on Rodgers. Also, this is the NFL, the other team sometimes steps up in crunch time. Best example of that is the 2010 37-36 loss to the Steelers.
2. While 3-18 is not impressive by any means, the article showed that some other established quarterbacks have similarily below-average records when it comes to fourth quarter comeback opportunities. I would like to see the numbers for every starter in the league, and some famous retired quarterbacks.
3. Rodgers has proved that he comes through when it matters. I don't think anyone watching the fourth quarter of SB XLV would call Rodgers "Mr. Irrelevant".