It's Call of Duty. Most people aren't that excited about it anymore, outside of the "brocore" CoD/GTA/Madden crowd.
Even on gaf, with its 90 page thread, the hype is at a minimum. The Killzone 3 beta thread is at 120 pages and counting, for comparison, and Halo: Reach's second official thread (first one had to be locked because it was too long!) is still going strong, with over 100 posts (> 2 pages) just today.
Call of Duty reached incredible heights with Modern Warfare, but it's recieved too many sub-par sequels in in too short a timeframe for for most hardcore gamers to continue to continue to care.