While Romo usually puts up good numbers (hence why he's a decent fantasy football QB), he's nailed on for the colossal, game-changing feckup in important games. It's certainly not a fallacy, and a big part of why the Cowboys haven't experienced more post-season success. In the past, he'll consistently have brain farts at the most inopportune times. Maybe he's learned from the past and changed? Btw, I've always admired Romo as he seems like a good guy, is tough, and handles the criticisms like a pro.
Therein is the fallacy, thank you. QBs are judged by wins and losses without looking at all factors. Romo certainly isn't the
big part of all three playoff defeats. The defense, the line, the receivers, etc. have all shared in it. Dallas has never had a championship-caliber defense since Romo took over in 2006. And until this season, they've had shoddy offensive lines (at least since 2010), weak coaching, bad drafts, and average running backs.
Had Crayton and Bennett made routine catches, Dallas beats New York in 2007 (both dropped/missed touchdown passes in a 21-17 loss). But everyone remembers Romo throwing an interception on that final drive but conveniently forgets Crayton not running his route properly on a beautiful fade prior too, as the ball sails just past him (TO would have caught that) for what would have been a likely game-winner. Crayton dropped a sure-fire long TD catch earlier in that game. Can't pin that loss on Romo as the major factor.
Romo is no more the worst offender than all those other players out there. That article I posted above does a great illustration at pointing stuff out. Do you label Manning a choker for his career 11-12 postseason mark and having lost a SB with a bad throw returned for the deciding touchdown? How about his side getting embarrassed in the big game last January? If Romo somehow guided his side to the SB and lost, would he get the same pass Manning and others do?
Romo could theoretically win the Super Bowl and critics would still find ways to blame him for this or that. I know plenty of fans of the Jets, Vikings, 49ers, Bills, Lions, etc. that wished they had Romo over the past decade.