I really like this movie, but I'm not a big fan of the voiceover. Unless its an integral part of the storytelling and conceit of the film (a.k.a.
Royal Tennenbaums), voiceover should be avoided, especially when it serves as a crutch to get JSP "caught up to speed" in challenging narratives.
That said, I think Harrison Ford's voiceover in
Blade Runner fits into the "casual private detective voiceover" convention, which is a staple of noir and fits into the cinematography and (osensibly) into the genre. That's probably why some people still like it, and why it doesn't completely ruin the film for me. That said, I might be one of the only people I know who prefers both the darker ending to
Blade Runner AND the
Warning: Spoiler! (Click to show)"Deckard is not a replicant" angle, which taken together concentrates a simple, powerful message about mankind learning too late about its own morality and humanity from its non-human creations -- a heartbreaking message which is sapped of power if humanity is not truly represented in our hero. I think it comes down to people finding the "twist" to be somehow more "bad-ass". I see dead people!
Anyway, yeah, this is a
Dark City thread, huh? I should mention that I thought the "shift" late in DC to a special-effects action extravaganza - slash - romantic melodrama was a bit much, and I hope some scenes temper this shift a little. While it stays true to the redemptive message of the film, I still see studio hands all over the finale.