The value of road games, and therefore the relative strength of schedule, changes based on the strength of the team playing the schedule.
For a higher tier team playing a lower tier team, the location doesn't matter as much. They're likely to win either way. Therefore, for a higher tier team a schedule where the tougher games are on the road is a relatively tougher schedule.
For a lower tier team playing a higher tier team, the location also doesn't matter as much. They're likely to lose either way. Therefore, for a lower tier team a schedule where the more winnable games are at home is a relatively easier schedule.
How difficult Nebraska's schedule may be is a factor of how good one thinks Nebraska may be.
For a higher tier team playing a lower tier team, the location doesn't matter as much. They're likely to win either way. Therefore, for a higher tier team a schedule where the tougher games are on the road is a relatively tougher schedule.
For a lower tier team playing a higher tier team, the location also doesn't matter as much. They're likely to lose either way. Therefore, for a lower tier team a schedule where the more winnable games are at home is a relatively easier schedule.
How difficult Nebraska's schedule may be is a factor of how good one thinks Nebraska may be.