User blog comment:Drkdragonz66/Call of Duty: Iron Wolf?/@comment-99.29.5.52-20120102173225/@comment-3121225-20120102184028

Already having an engine doesn't make it much easier. They still have to create all of the assets (models, sounds, animations if needed, etc.) and implement them. Which takes a ton of effort (so... much... coding...). Not saying this justifies Black Ops, but it's more difficult than people think to make a game.