I've been to all of the Big Ten stadiums at least once, save for Rutgers. I'll offer my thoughts, understanding that many may have different experiences.
Nebraska was a pleasant experience each of the times I went. Of course, we won one of them, so that is nice. Fans were still nice even in defeat. Great stadium, great environment. Pregame Stadium tunnel entrance by the home team was cool.
I haven't had the nightmare experience at Iowa that many have expressed, but I usually go with a family friend who is a Hawkeye fan, so maybe that is part of it. I have enjoyed the tailgate lots there and I'm with people I know. They definitely support their team. And, the stadium is crazy, and crazy loud for a couple of the night games I was down there. It would be nice to see a Gopher team win there, which I've never got to see in my 3 or 4 trips.
Wisconsin is Wisconsin. Great pride in the school, Jump around, etc. Worth a trip over there to watch. 2018 was one of my favorite Gopher memories.
Been to Michigan a few times. Underwhelmed with the crowd noise for how many people are there. But, I'm sure it is different when OSU or MSU is there.
Ohio Stadium had some cache to it, quite imposing. I had seats down in the corner of the first few rows....very loud down there. I was impressed. I went to the night game in 2015 (?) I think. Leidner game where he got targeted on a pick six and they reversed the call giving Buckeyes the TD. Crowd absolutely played a factor in getting that call overturned. Loud place.
Penn State a little like Nebraska, nice fans, supportive of their team, loud. The stadium has a unique look to it. Looks like a NASCAR track from the outside with all the railings and girders showing. Does not look like a traditional college stadium especially for how old it is.
Most other places are just places, in my opinion. Illinois, Purdue, Indiana, Michigan State, Maryland, Northwestern seemed nothing special. All Gopher road trips are fun, but nothing about those stadiums or those cities stood out to me. Maryland was a little better because I enjoy DC and spent a few days there before the game. But, the stadium was underwhelming, less than half full of fans, etc. Northwestern is nice because Chicago is near by.