Thanks, Joel, and I'd add that sometimes we specifically request discs and can't get them. Milestone's upcoming Phantom of the Opera disc, for instance, may not get reviewed by us since it turns out that they've promised more press screeners than they're getting from Image. So there's not much we can do there.
Adam's piece is well worth reading, though. It's difficult to sit down and write something that's worth reading (especially 600+ times) about a movie and a disc, and often we DVD reviewers/critics get a feeling of being unappreciated when folks post that we have no right to spout off about the merits of a film. There's probably not much more that we can add about Citizen Kane, it's true, since those fields have been worked over so long and so hard already, but there's a big world of film out there that hasn't really been appreciated properly, and the DVD revolution is finally making much of that forgotten film heritage available in cheap and high-quality form. Unless your DVD buying/renting is limited solely to films you've seen before (something that makes zero sense to me, but whatever floats your boat), why wouldn't you look to a review to get a sense as to whether it's something you might like? Often the people selling discs misdescribe the film badly on the keepcase cover, so you can hardly rely on that.
But every now and then, it feels pretty good, such as Bill Burns' kind comments above, or when a filmmaker writes and refers to your review as "perceptive" even when it's not entirely favorable (my review of The First Nudie Musical), or when Roger Ebert himself acknowledges you as a "critic" and cites you as an authority
http://www.suntimes.com/ebert/greatm...seofusher.html and it makes the effort feel worthwhile. So I guess there's nothing to do but take the heat and tell those who don't want to read about the movie in DVD reviews to skip right to the technical data, since we're not holding guns to the readers' heads. Usually.