See
http://www.ubuntulinux.org and read the notice about Ubuntu 5.04-preview
There it makes much sense to use torrents, since you are downloading CD-images and that's a high cost for bandwith. If you use BitTorrent as a download manager for software you get from editors' websites, than it's just perfect. Another different case is if you use to visit links-repositories or use the search engine integrated in some P2P clients from where you can't realise which files are official, which files are copies from the originals (like zipped the original file, etc.) and which files are plain fakes.
In our particular case, msgplus.net doesn't actually need to use BitTorrent because it can offer as much bw as your peers would. And the file to download is really small compared to the Ubuntu-Linux CD-images.
This is for me the main reason not to put up a torrent download for MP!