In Romo's case, it is all the talking heads that for years now have been billing him as the next wonderkid at QB. He's not and probably won't be. But Dallas could go 15 years before they find someone better. Good QBs are hard enough to find - great ones, nearly impossible.
Let me preface the following by saying, I'm not a big Romo fan - not at all actually, so this is totally unbiased.
It's not that Romo is bad, quite contrary - he's a good QB, perhaps too good for his own good.
There is talk that he is so confident, he believes he can make any play, any time, against any opponent.
He actually played quite well in an extremely hostile environment last Sunday night.
He's being ripped for basically 2 plays -
The fumble play was Romo trying to make something happen - if he doesn't fumble he's being heralded as "a guy who does what it takes to win" & "oh man, that was a gutsy play", etc & so on.
The INT he trew however was an absolute horrendus throw, he had no business throwing that - again, him thinking he can make any play, any time.
He's got some Brett Favre in him.
23 for 36, 63.9% completions, 342 passing yards, 2 TD, 1 INT, 1 fumble, 1 fumble lost on the road, QB rating of 101.9.
This was on the road, in New York, on the 10th "anniversary" (probably a better term for that) of the 9/11 attacks, in prime time against what projects to be one of the best defenses in the NFL is hardly "bad".
In 2006, he's still getting ripped for fumbling a FG snap in the playoffs - it was his first year as a starter (in which he didn't start out as such) on the road vs the eventual NFC representative in the SB.
In 2007 he threw for over 4200 yards, 36 TD & lost to a divison rival at home in the 1st round of the playoffs, the Giants went on the win the SB if memory serves.
In 2008 he missed 3 games, but went 8-5 as a starter, they missed the playoffs.
In 2009, he only threw 9 INT's, led the Cowboys to the playoffs, beat the hell out of Philly in Round 1 of said playoffs (did not turn the ball over) & they lost to the Vikings in resounding fashion - in Minnesota.
2010 he broke his collar bone, week 7, Dallas was 1-5 prior to that, and missed the playoffs.
When he's healthy, Dallas has been a perenial playoff team.
Only 1 team wins the Superbowl every year.
Only 12 teams make the playoffs, in the 3 years Romo has started the majority of games for Dallas he's gotten them there - he's given them a chance.
Perhaps more so than any other major sport, the NFl is a team game, and starting QB's are placed under the microscope more so than any other position in any sport, they are subject to the most scrutiny, harshes critques, and typically given way too much credit when their teams win - it take 53 guys to be all on the same page & a special alignment of the stars to win in the NFL.
I don't think it's fair to place all of the blame on Romo (or any quarterback for that matter) when their teams don't reach the promised land.
Just my 2 cents.