By anyone do you mean, army, navy, air force, Pitt, Rutgers, wvu, Boston college, temple, Maryland, Syracuse and a random MAC school? That was the typical schedule in the 70s-90s.
Why did we have a losing record vs OSU, Michigan and Iowa from 90-2012?
Look at who we played in bowl games, and the record.
Yes, there were a lot of mediocre eastern teams, but somehow we played as well as any team in the country for bowl games. Why? I would say we had more discipline and prepared better. We got a lot out of those soccer players in the secondary. But like today, we had some superstars. I remember when Curt Warner showed up. Just incredible acceleration and speed.
As for 90-2012, we were pretty close to even with OSU and Michigan and certainly dominated Iowa during the 1990s. After that, as everybody knows, Joe Paterno had aged out but refused to retire. This really hurt recruiting. Then there was nepotism with Jay. It became ugly, and sad to see a great legacy gradually diminish, then get completely tarnished under the weight of corruption.
We also had the B1G officiating corruption, a huge obstacle. That seemed to be a response to Penn State's early success within the conference. The B1G needed to protect The Game and the Rose Bowl. It used its officials. Some were notorious.
Remember Witvoet? The officiating shenanigans became a major driver behind the adoption of Instant Replay. But even Instant Replay was not enough (if you could conveniently lose the video feed). You might even have the officials call time out for you if there was a chance of having the clock expire.
There was also the Sandusky scandal, which had nothing to do with the football program. Yet it was the football program that paid the price. Conference schools that hated Penn State milked that scandal for everything they could get. Truth became lost within the confusion of emotion. The hypocrisy at MSU reached an epic level.
A lot of footnotes need to be added when making some of the generalizations that people tend to make. The record doesn't tell much of the true story. There was a lot of non-football history to consider. It was a lot more than just the play on the field.