User blog comment:Crazy sam10/Infinity Ward explains leaving Modern Warfare series/@comment-81.99.27.82-20130531122846/@comment-78.97.91.207-20130605114629

So liniarity is a fundamental concept in CoD? This is an extremely cheap excuse "don't change it because it works". It works well in making the SP an interactive movie, not an actual game. Open design (not open world, I just mean bigger, more open levels with many side paths) would give the game a tone more replay value.

Games need to evolve, selling the same formula over and over and over again means nothing more then tiring out the franchise. And in this case, the "innovation" I'm talking about wouldn't harm the actual gameplay, just make it more enjoyable.