"There usually every download request ends up successful, "

Think about what you said. So on Kazaa everyone runs a cable modem and open ports are just sitting there waiting just for you to connect and download.

I know, I know, you don't know how it works, but it just does. Think about the basics, if it's true P2P then someone out there has to let you connect to them, and if they are all busy, then you have a problem. If Kazaa has some very fast servers on T3 lines set up, paid for by all their $$, with all the MP3's they can find loaded on them, then maybe that's what you are getting and it's not true P2P.

Oh, oops.... I forgot, no one cares about P2P, they just want their files.