Then Infinity Ward created Modern Warfare 2. This game broke all records and ended up selling a lot more than the original Modern Warfare.
Yap, broke records with broken gameplay!
Introduced retarded killstreak bonuses like the insta-win chopper.
For serious though, MW2 barely did anything new. It just turned the series into an even bigger spamfest, just when we thought it couldn't get any worse.
Barebones mode in BO is a pretty huge addition for anyone looking to avoid getting killed by explosives or toy cars every few seconds.