Several that deserve mention:

Nebraska: Most of the seats are in the endzone, and a long ways away from the field. Then, you have to go all the way down to the bottom for concessions and restrooms. Nice fans, but that doesn't make up for the crappy seating. And, don't get me started on Runza sandwiches.

Colorado: On TV, they talk about the view of the Flat Irons. While the town has some nice views, most of the seats in the stadium do not. The visitor's seats are terrible -- the stadium was originally a horseshoe with a track, and the visitor's seats are beyond the back line of the endzone. On the west side, the concessions were all inside the old fieldhouse, which is a dump (and which limits the sideline seating--they should really knock this thing down). The fans are awful -- the students are mostly California kids who couldn't get into a good school and are a bunch of low class punks.

Tennessee: Admittedly, I went to Knoxville during covid, so I didn't see Neyland in form, but, it was bad enough with 10,000 people, I can't imagine how bad it is with 100,000. For OU and Texas fans, this place is the Cotton Bowl without the attraction of the State Fair. They really need to do a complete rebuild of this place like A&M did with Kyle Field. Knoxville is a nice town, and I guess taking a boat to the stadium sounds neat, but the stadium itself is a dump.