The reason Isohunt was so special for me is because it hosted one of the friendliest and most helpful communities I have encountered. The mods patiently answered questions and offered help on a range of issues from software to hardware. It was a true community.
And of course you can find practically any torrent out there very easily with their search engine.
Yet, report after report shows that torrent sites do not hurt the entertainment industry. A lot of people still manage to flourish in their development and sales despite (because of?) sites like isohunt. Perhaps if you did more research or made a better product this would not be the case.