The Gophers haven't been awful for 40 years, as is often claimed. There have been had years and pretty good years, just not good enough to get a Big Ten title. I was looking at the media guide to look up the Gophers records. I just looked at Big Ten results, because non-conference schedules are so variable.
I defined bad as a year with two or less Big Ten wins in a season, and mediocre as three of four Big Ten wins (counting ties as half a win and half a loss). What really stands out when you do this is the 1990's. From 1991 to 1998, the Gophers were 12-52 in the Big Ten. During that stretch, the Gophers finished 1-7 five times, 2-6 twice, and only reached mediocrity one time, with a 3-5 record in 1993.
It's the 90's that gave this impression that the Gophers have been awful for 40 years.