I think you have mostly been unlucky. I have found that i get speeds much faster than on kazaa with bittorrent.

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AMD Athlon64 3000+
48x CD burner
16x Dual Layer DVD burner
512 Mb RAM
Windows XP Pro/Debian unstable
Adobe Premiere Pro 1.5
Firewire card
ATI Radeon 9800 Pro
2 x 17" CRTs, 1 x 17" TFT