Int-TD ratio is not nearly as indicative of turnover ratio as INT-attempts.
I'll just use the guys some of you were all talking of, in order from Best to Worst
2012:
Eli: 1 int every 35.7 attempts (or 2.8% of passes)
Brees: 1 int every 35.3 attempts (or 2.8% of passes)
Romo: 1 int every 34.1 attempts (or 2.9% of passes)
Career:
Brees: 1 int every 37.3 attempts (or 2.7% of passes)
Romo: 1 int every 35.6 attempts (or 2.8% of passes)
Eli: 1 int every 34.1 attempts (or 3.2% of passes)
Obviously the percentages aren't that accurate since I rounded to the nearest 10th, but I think the first stat still kinds of displays the separation.
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To contrast with an Elite QB and another QB people consider to be good but not great:
Tom Brady:
2012: 1 int every 80 attempts (insane 1.3% of passes)
Career: 1 int every 48 attempts (2.1% of attempts)
Matt Ryan:
2012: 1 int every 44 attempts (2.2% of passes)
Career: 1 int every 44 passes (2.2% of passes) -- Remarkably consistent
So it's fair to say that Romo has some issues with turnovers, and while he may not be the only QB with turnover problems, he's one of the few that's considered to be good... and in this particular example the only one without a ring, and a plethora of other games where he displayed an incredible ability to shoot himself in the foot with interceptions.
Is it overblown? Yeah, because Romo's also had great years with turnover ratio (2009,2011). But it fluctuates.