I think elementary school libraries tend to be underfunded and are generally badly done. Many now place a great emphasis on making the kids take out books that the teachers and/or librarians deem to be the "correct" reading level for them, and disallowing them to take out books that don't get the seal of approval.
I noticed that my oldest would take out the same two books every week from the school library. She never looked at them. When I asked her why, she told me that she knew the librarian would approve these two books, and it irritated her when the librarian wouldn't let her take out others. So, she just kept checking out the same two to mollify the librarian.
Since we go to the public library at least weekly, and let the kids pick out a tote bag full of books at a time and actually read them, I guess we've all come to the decision that the school library is pretty irrelevant to our family. I can see the value in having school libraries for kids whose parents aren't library users, but wish school librarians were a little more progressive, and a little less like librarians used to be 50 years ago.