Usenet is becoming very difficult to use because indexing sites like Newzbin keep being shutdown. They are either sued or have a hard time finding a payment provider.
Without a good indexer, downloading from Usenet is beyond retarded. There is a limit on message size so movies or tv episodes are split in multiple messages, and the protocol is unreliable so the messages are often corrupts, which requires posters to submit par files to let downloaders repair the files.
Also most ISPs don't keep binary groups so one has to subscribe to a paid provider like Easynews. And even with the best providers there's a limit to how much retention they can do, so Usenet content is a lot more volatile than P2P. Ex: if you are looking for the 6th episode of the 3rd season of Falcon Crest you are more likely to find it on P2P. Furthermore, Usenet providers comply with takedown notices, making the download of some stuff pretty difficult.
Another annoying thing with Usenet is that for some reason idiots from The Netherlands keep posting US movies and tv series with hard-coded NL subtitles. I don't know why, but it's been like that forever, it's the only country that does that with such magnitude. If you don't have a good indexer or an advanced provider like Easynews (who posts frameshots for movies) it's hugely annoying.