2 years development is more due to EA being their publishers I think. EA are the worst publishers ever by far. I hate their marketing strategy and so called DLC. Funny how they call first day DLC as an expansion pack when it's just the part cut from the game.
Coming back to game, even though there is only 2 years gap, it still is vastly improved than COD, just shows how lazy COD development team are. I like how there are more action/playable cinematic scenes in the campaign, just hope they can match the story of Infinity Ward's game and that's the only thing I liked about COD. I am not a graphic fanatic when it comes to shooter games but I can still see improvements in lightning and lens flare. Hopefully it'll live up to expectations. PC users won't regret it so I don't need to worry about