I don't grade offensive lines based on one play, anymore than I grade Romo's entire night based off one stupid interception. It's kinda of a really dumb way to look at things, which is why NFL people don't do it. I carefully watch the games in their entireity based on all snaps, and I try to objectively look at things to view exactly what happened and where the blame is assesed. For example, if you have an existing confirmation bias you might blame the OL for letting a Giants defender run into the backfield untouched in the 2nd quarter, but if you rewatch the game and analyze it you would see that the Cowboys were employing an empty backfield and the Giants ran a blitz in adjustment to the empty backfield that leaves a guy unaccounted for.
The bottomline is that the interior OL imposed it's will on the Giants DTs as the game went along, capping it off with a 12 play/7 minute drive in the 4th quarter featuring 9 and 15 yard runs on Murray running right down the Giant's throat. Justin Tuck and Osi were largely invisible. JPP is the only player on the Giants front 4 who had any real impact on the game, against a guy who's playing left tackle for the first time in a game since high school. The Giants entire defensive, if not organizational, philosophy pins on the performance of the defensive line. That's why they invest an indordinate amount of draft picks and cap space into their DL to come at an offense in waves. Unless they completely dictate and dominate the game, they aren't winning . They were allowed to neither dictate nor dominate the game.
And for what it's worth, when people start throwing around words like "homers" and "realist" I pretty much take it for granted that I'm dealing with a non-informed fan. When the "realists" mindlessly bleat the same groupthink platitudes from the collective hivemind, it's really not "thinking outside the box". It's utter juvenile nonsense to me by people who don't have a relevant point to make.