I see no one accepting anything like mediocrity... it is just an objective analysis. Look at NU on the field this year, look how they are coached and how they play... do the same with Texas and you conclude that NU is pretty mid-level and Texas, while not that good, are a level up. So... w/o excepting anything or conceding anything... but just assessing the probabilities here... were they to play Texas, as much as I hate to say so the Horns would most likely beat the Huskers (and, perhaps do so handily).
Were the Huskers to play the other teams mentioned as possibilities --- like Georgia, LSU, or Texas Tech --- objective analysis would again predict that the Huskers would be more than likely defeated by each of these teams too. So... I do not see the Huskers favored to beat any of these teams. that said, anything can happen in one game so one never knows... but by prediction analysis... NU is an underdog in each of these games.