I would say this was really more of a 3.5 for me, and it's because some of the writing she does about books worships the book-object so much it's like... grating to me.

The chapter where she burns a book made me roll my eyes so hard, and it's because I, as a child of two librarians and the grandchild of another, know that sometimes books need to be thrown in the trash!

Otherwise the book was a really interesting, and if you're not super familiar with all the services a library offers, this is definitely a read for you! Really good arguments against the folks who say libraries are outdated, and that no one uses them. (I, for example, borrowed this book from my local public library!) If you're more connected to the present reality of library uses, the history parts are pretty interesting. It definitely kept me engaged, and maybe if I was a little more sentimental about books-as-objects I would find it less grating. (Her engagement with issues of homelessness is also uh kind of iffy, though she does finally kind of admit it in the end, as if you couldn't tell from the way she writes about it before that moment.) But definitely well-researched, well-written, full of interesting tidbits and little pieces that don't end up feeling extraneous to her overall story.