That depends on what you mean by “biggest.”
Biggest in terms of media attention? Absolutely. Biggest in terms of rivalry-related drama? Almost certainly.
Biggest in terms of implications for the rest of the season?
That is yet to be determined.
If the Vikings win tonight and go on to claim the division by one game over the Packers, then yes, tonight’s game will look huge in retrospect. Same as if they lose tonight and fall one game short to the Packers.
It’s all relative. And none of that can really be gauged until after the season. If the Vikings go belly-up and finish out of the playoffs, every loss will be looked at as if it were monumental. If they win the Super Bowl, a few regular season games will be highlighted as having greater significance than others.
What makes tonight’s game seem more meaningful is, of course, all the surrounding drama. Favre vs. the Packers. The media crush. The culmination of months of hype.
In that sense, I think Foreman is right. This is the biggest regular season game in Vikings history.
And it could still end up being utterly meaningless in the larger football scheme.