I agreed with Phil Simms when he said the "it" factor is just talent. We've all played sports and you know when you meet someone with extraordinary talent combined with great discipline you get a superstar.
Romo has the talent he just needs to gain the discipline. It's hard to watch him as he's cost us 2 games this year, but he played great against the Panthers and Bucs. I know his stats weren't impressive in the Panthers game, but he protected the football very well. Turnovers are what kills games. Last year we were first in turnovers. If you take away the turnovers even half of them we are a top 5 team. Romo doesn't need to make plays every week. A great QB knows when to lean on his teammates.
Of the QBs I've watched.
Peyton, Eli, Big Ben, Kyle Orton(great game manager right now), Cutler, Rivers have all been impressive.
I've not watched Brees.
I think the most underrated guy may be Orton. He strikes me as simply intelligent this year.
Big Ben is the best QB I've watched outside of Peyton this year. I know that sounds crazy, but his throws have been lasers. Give him more throws and he puts up insane numbers.