People may be turned off by this on PC due to the system requirements and hard drive space required (66 GB in total if Steam is to be believed), but I bit the bullet. Despite the hard drive space, the download is actually separated between multiplayer and single player/co-op, so you can choose to download one or the other first depending on your preference. What's kinda cool is that PC players get the next gen version first, which was kinda the big draw for me. It also gives me an opportunity to test my shiny new gaming PC that I built.
I know Call of Duty multiplayer isn't the most balanced, and it is a console game at heart, but at least the co-op looks cool, even if it is unoriginal.