Oh I don't think he was debating Ryan Field vs the Shoe, I think his calculus was more like this:
We know the following:
Ryan Field < The Horseshoe
Chicago > Columbus
but....
Ryan Field + Chicago ? The Horseshoe + Columbus
FWIW I was speaking of visiting Ryan Field on it's own merits without any comparison to playing at Ohio Stadium.
Northwestern is consistently one of the weakest visitor game day experiences in the conference. Indiana & Minnesota being the other two at the bottom of the barrel. Two caveats on the latter two; Ohio State at Bloomington can be a great time merely because it becomes a de facto home game and Minnesota's new stadium alone makes the experience far better than in the awful, awful Metrodome.
There are plenty of amazing venues for games within the Big Ten....Ryan Field just isn't one of them.