Romo had some historically bad defenses and offensive lines (in terms of pressures and not necessarily sacks which Romo was often good at escaping and making plays). When the team and coaching surrounding him was good he delivered with playoff caliber teams. Had Parcells stuck around, I'd wager the team would have at least reached a conference championship game, possibly even a Super Bowl. After he left, it was a slow decline with Wade (even then a division playoff game was reached which ended when Romo was running for his life in the Minnesota game being sacked six times facing well over a dozen hurries) and then the coach in training took over. That was when the historically bad defenses happened along with the piss poor offensive lines remaining constant until they were slowly improved by 2014 due to the presence of Will McClay where they should've won in Lambeau but lost. Then Romo got injured in 2015 and again in 2016 and so it was effectively over for him. To compare the majority of the teams he was QBing under as far as talent was concerned compared to what Dak possesses now as equivalent is simply absurd.