Let's not get too caught up in semantics here. When you look at the 4 losses, 1 was a game Romo did not play (AZ), 1 was where he got knocked out of the game (WAS), 1 was the first game of the season (SF) where he was still recovering from the surgery, and the other was the first Philly game where he clearly was not healthy and coming off insufficient rest.
In summary, Romo has been fantastic this season and we have good reason to be optimistic in his performance, provided he is reasonably healthy.