Thinking about it, there are a lot of these types of 'list' shows around, mainly the 'Best Ever'/'100 Greatest'/Most Loved' type thing, usually on Channel 5.
Without doubt, the better ones are when they only use one presenter, as opposed to extracting a series of scripted soundbites from a host of so-called "celebrities" and "experts". I've only managed to sit through a couple, most notably 100 Greatest Toys presented by Jonathan Ross, which certainly brought back a few fond memories.
The point you make is valid for most of these shows though Glyn, a few seconds of actual footage of the item padded out with many minutes of pointless drivel. It's probably why the shows (on C5 particularly) go on for around three hours or so. With just an informative voice-over commentary, and with more clips of the subject, these list shows would be a lot more entertaining and much shorter.