Since the books are well-used, that pretty obviously shows that the library is popular and doing a good job at serving some customers.
The concept of the utility of media is important.
If Family Guy was 24/7 every channel, approval ratings and viewership may still stay high.
Is that a proper way to measure utility, or value?
http://www.pewinternet.org/2016/09/09/library-usage-and-enga...
If we curated public buildings like libraries curate books, we'd all sell our libraries for $1.
My library tends to have a larger non-fiction section than most. Another town houses a huge collection of movies. Yet another hosts a tremendous audiobook collection. A simple online request will deliver any of these materials nearby or I can wander in and browse if I'm looking for something more mainstream.
Perhaps you should consider getting more involved if your library isn't meeting your needs.
And thinking changes - I used to appreciate libraries until they screwed me over, left my interests and needs behind, and became a daycare center. I don't want to read romance novels nor juvenile fiction, regardless of how well-thumbed they are.