I have written before on how spousal hires in academia are wrong. Giving somebody a professorial position just because they are sleeping with somebody the university deems valuable is a travesty of what the academia shoud be about. Talented young academics are cheated out of jobs they are qualified for and students end up being taught by people who didn't go through a rigorous hiring process (or any kind of hiring process.) Of course, the students have no idea whatsoever that some of their professors are not real scholars. Spousal hiring is something that most students don't even know about.
There is another reason why spousal hiring is detrimental to the academia. Many of the spousal hires are not educators and scholars in their own right. This stands to reason because if they were, they wouldn't have needed to rely on nepotism to get hired in the first place. Since they are often incapable of producing any legitimate scholarship of their own, they often end up in the administration. And that's where real fun begins. All those years of realizing that they were hired not on their merits (at least, not on their scholarly merits) and feeling inferior to the real academics makes them resentful and willing to do anything to make the lives of actual scholars as miserable as possible. Working as a paper-pusher in the college administration allows them to inundate their former colleagues with all kinds of senseless paperwork and adopt a highly condescending manner of addressing those of us who are actually qualified to do our jobs. It is very annoying to have to pay such a price for somebody else's personal life.