I hate Dallas, but it's not fair to blame only Romo. He always seems to process 1 or 2 routes and isn't focused on the big picture each down, but he's not the worst QB in the league. If anything Dallas has a combined issue with it's offensive ( literal and figurative ) line, and honestly, name one WR who is actually hustling each down. You can't expect Romo to hit targets that aren't working to break out.
On the other hand, Eli Manning has at least 2 targets, actually 3 ( Hicks, Nixon, Cruz ) who go full out each down. And while we have no running game, it's enough to get yardage and extend the clock.