It has its merits. If I want a document's formatting to be consistent upon delivery and accessible to anybody with so much as a web browser, I export to PDF.
I use them all the time, it has its place.....but people tend to overuse them.
Nothing worse than someone sending me data as a fucken PDF file. Hey here is a table with a bunch of data, it is spread over multiple pages, and no you can't get the data as a csv file. Because I want you to spend a lot of time verifying that the data has imported correctly.