Well if we are going to debate the uses of torrents all day the problem isn't going to get solved.
The question as is mentions nothing about obtaining things illegally, so why not just assume it was for legal files and go from there.
First thing to check is use uTorrent's check to see if the ports are being fowarded properly. I can't remember exactly where it is, but its an option in one of the menus. It isn't labeled explicitly in the menu what it is, its something else and then there is a button to click that tests if your ports are being properly fowarded.
Likely that is the problem, it isn't unheard of for a router to just magically quit fowarding ports.
Check that and then get back with us if the problem still exists.