From the preview by Nate Ahearn of IGN:
"I'm not one to usually get excited over downloadable content. I figure I've already paid my dues in buying the game. I don't really want to fork over any more of my dough to expand the experience, especially if the gameplay is as good as what is delivered in Call of Duty 4: Modern Warfare. But just about a month ago Infinity Ward brought a few IGN staffers down to their Burbank office to try out the set of four downloadable maps for ourselves. After a day of playing and having now downloaded the final versions of the quartet of death canvases we can say that there's plenty to be excited about."