Torrenting is fine for newer episodes, but what about older stuff? I tried torrenting Mahou Tsukai Tai for ages, but it didn't work. Not ONE seeder. Same for many older/obscure series/OVAs. This is where torrenting FAILS. No, until everyone seeds EVERYTHING 24/7, this proves the failure of this method of downloading. Why? Because I know of fan sites that have VAST archives of series/OVAs/movies etc - via Direct Downloads (Megaupload). One in particular has MTT, amongst others (I'm getting Gatekeepers 21 from there as I'm typing this).
I don't even bother using torrents for the latest episodes (Code Geass R2, xxxHOLiC Kei, Macross Frontier etc), as another I know of has these via Megaupload whenever the subs are out.