2008 was also a team poised to run through the regular season as well, although their record didn't reflect that.
2009 was a great season as well. Dallas had by far the best defense that they've had since Romo became the starter with their defense being 2nd in the league in terms of points allowed, and 9th in terms of yards.
2011, 2012, and 2013 were not necessarily good teams, particularly on defense but they were still good enough to be in a postion to gain a playoff berth going into their week 17 game.
This year's team is probably up there with the 2007 team as far as overall talent, but it's unfair to say that this year and '07 were the only good teams that Romo has had. Heck, even in 2006, this was a playoff team.