"Anybody who comes at the engine needs to remember it's the 60 frames they love in the first place. And we can make it beautiful - that's through years and years of working with the engine, improving upon it and improving the pipeline and improving our approach, our lighting rendering.

People like to talk about the engine, but the truth of the matter is that this isn't like something that was invented six years ago. At this point that engine doesn't resemble anything like any engine – we've ripped out the UI system, the rendering and the lighting are all new, the core gameplay systems are all new.

To me, it's like I never really understood. It runs at 60 and it's gorgeous. What exactly is there to be upset about with the engine?" - Treyarch's David Vondehaar

I feel like the Call of Duty audience is really into flashy graphics, so this kind of argument is bound to happen. That crowd will just have to wait for the next-gen Call of Duty to show itself before they're happy.