To put it another way, those opponents are 16-6 against the non-Nebraska teams on their schedules.
CU is undefeated. (They're a ranked team that may be in the Pac-12 title game.)
Troy lost to Boise State badly. (Troy is a very good Group of 5 team, but not a great one; hence, they lose badly to Boise.)
Purdue has lost to Northwestern, Eastern Michigan and Missouri by a combined eight points. They've won their last two. (Purdue likely will go 6-6 again if they win their home games).
Michigan has lost only to Notre Dame, a top 5 team with a legitimate shot at 12-0 and the playoffs.
Wisconsin is the best team in the B1G West, but they have an inexplicable home loss to a mediocre-at-best BYU team.
In any regular season, a program like Nebraska would be 3-2 against a slate like that. In a good year, 4-1. In a bad year, 2-3 or 1-4.
Unfortunately, we seem to be the gang who can't shoot straight, so we're 0-5.
Aside from OSU, we could win ANY of the other six remaining games (Iowa is a long, longshot, of course, but that's still a long way away, and anything can happen between now and then), but we're likely to win 1-3, based on playing more fundamentally sound football.
Northwestern: Probably about a 30 percent shot at a victory.
Minnesota: I give us a slight edge, but it's probably a virtual tossup.
Bethune: If we lose, I'll .... I just don't know.
OSU: Zero chance.
Illinois: See "Minnesota" entry.
MSU: They're not that damned good, and if we improve between now and then, it's probably another tossup.
Iowa: See note above about anything can happen, but it's probably about a 5-10 percent chance at a win.