The game is free on youtube if you want to revisit it to back up your points, but after rewatching it, I think Romo was pretty solid on the last drive.
He wasn't perfect, but he did a solid job and should have came away with a game winning drive despite Barber wasting a majority of the clock.
I disagree that Romo wasn't a good big game QB as his playoff efficiency is quite close to Eli's who will likely get into the hall of fame mostly because of his playoff performance, but that is your prerogative.
The main point is that despite playing in a more QB friendly time period than Romo did, Dak's efficiency is worse.