The thing that strikes me about Romo is that I do not think that he is a leader. When he yells at the offensive line or a WR I don't really see it making an impact.
I remember this year that Ronnie Hillman said he was more worried about the wrath he would get from Manning than he would from the coaching staff. Now it may be unfair to compare Romo to Manning, but there is a point there. I do think Romo would do better under a coach that is a more vocal and charismatic leader, but that is another story.