Ranking stadiums is pretty subjective. Is size or quality/fan amenities more important? No matter how you rank it, pretty safe to say that TT, WVU, ISU, and KU are 7, 8, 9, and 10.
Texas and OSU are probably tops. New BU and TCU are probably next. Really nice but smallish. KSU will hover around there, too. Not sure where to put OU. It's big but just a big craphole.