The thing I miss most was having one single newsreader interface that I could configure as I liked. With web forums everybody has their own idea of how things should work and I end up having to remember a dozen different flavors of "markdown" and ways of filtering users or threading posts. The Usenet had issues, chiefly the lack of a good way to moderate channels, but I wish we had gone with an open data model instead of the countless walled gardens that sprang up in its place.