I torrented & watched Lucky Star when ep. 1 first appeared on Tokyotoshokan.
I liked it. I torrented, watched & enjoyed every ep.
I did the same with Magical Girl Lyrical Nanoha StrikerS (mainly because I liked the first two series). I've saved, backed up (duplicated on HD & DVD, as well as converted to .MPEG & burned onto DVD for playing on DVD player & TV) these.
I've d-l'd & watched eps 1 of One Piece, Bleach, Naruto, Gurren Lagann & Kaiji, then wondered why I bothered wasting valuable downloading & watching time on these. Afterwards, I deleted them.