I have to agree. Early on in our page design, we had some nice hi-res pictures we were using as placeholders. The problem was that it made the rest of the page elements look better at first glance than they actually were. Once we knocked out the images, we realized the page looked like crap and we had to go back to the drawing board.

(not saying our page looks great now, but it's definitely progressed from some pretty ragged looking early versions)