first off i gotta say my opinion has changed many times on this subject, but having just recently watched all three prequels on dvd.starwars.com i'm extremely happy with them. i'm the type whom was generally forced into agreeing to disagree with everyone over TPM & AOTC. but since ROTS i feel that those two are validated and actually quite good in the long run, and there was a time when i loved lotr trilogy over prequels but have within the last year practically lost all interest in Rings. (there was a sad time when my wife and i only owned the entire extended trilogy, so they got played it out.)
but i have still yet to watch all six in a row, i've tried. but the days aren't long enough.
another reason i've come to enjoy this trilogy more, is the expanded universe which sadly i haft to say without it my interest in starwars wouldn't be half as strong.