Its may be just me, but I have always found Usenet, Gnutella (the the zillion variations thereof), Emule and the various other P2P programs to be too hard to use. I have so far used Direct Connect, Kazaa and Bit Torrent and I have found BT to be the most useful for my purposes. If you know where to look, and by now the community is so big that you should, then you will have no trouble finding the things you need.
What do I care if 600 different versions of a movie can be found on Kazaa, when I only need one and I need it to go fast. Thats why i prefer BT.