The question of this thread is tough to answer. Because we've never been in this situation before.
Always prior, if we were playing for a title, it was in the title game. Win it all, or go home dejected. We've never before been in a place where you have to win a game to get to the game. Or in this case, win 3 games to get to the game.
One could categorically say this game against Ohio State ranks below every title game we've ever been in, including the old bowl games where you're not really playing the team you hope to beat out to get the #1 ranking, instead you (and they) are playing some other team and trying to impress the AP and Coaches poll voters that you're the better one. Remember those days? Heh, seems forever ago now, but it's only about one-third of a human lifetime in our past: 1997.
So this game is less than a title game. But it's more than any bowl game that doesn't involve a title. That puts it pretty high up on the list. Maybe in the top 25 or 30. I mean, how many times have we played with a national or conference championship on the line? Certainly all 4 (or 6, or 2, however you personally count it) national and 16 conference crowns that we won. But several more that we played for but came up short.
For that matter, which ranks higher on our all-time list, an SEC championship match or a playoff game prior to the national title final? Dunno. Contrary to the opinions of a few on these boards, conference titles are still valuable and important to the program (and most of us fans). How does the SEC CG rank against a first-round or quarter-final or semi-final game in the national playoffs? Hard to say. Objectively, it is harder to get into the SEC title game than into the CFP. So one could say Atlanta is more valuable. But hard to say, because each game of the playoffs has an opportunity value for the next round(s) built in. *shrug* Logic gets a little fuzzy in this apples-to-oranges comparison.
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Then you set all the logic aside and switch to talking emotionally. This is where the '85 Sugar Vols, and '15 Georgia (the Dobb Nail Boot), and '22 Bama ("college football at its absolute finest," as the announcers declared after the game) come in. We can't know how '24 Ohio State will measure against those games emotionally until we've played it.
But one thing is for sure: as a fan base, we have put a lotta skin into this Ohio State game up front. We've made the stakes big. But the bet could still go bust, in which case we'll all just as soon forget about it. It will pale in our collective memories pretty fast (except the nega-Vols, they'll dwell on it for years).
So emotionally, if we win this one, it could be right up there in the top 10 all-time. Even if logically it's lower down, somewhere just inside the top 20 or 25.
That's how I see it, I guess.
Go Vols!