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All Call of Duty titles since 2005's Call of Duty 2 have been built with the IW engine, which has been heavily modified for each new series entry.

Some commentators have suggested the engine is outdated, but Vonderhaar doesn't see what all the fuss is about.

"Anybody who comes at the engine needs to remember it's the 60 frames they love in the first place," he told OXM. "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," Vondehaar added. "It runs at 60 and it's gorgeous. What exactly is there to be upset about with the engine?"

Last year Glen Schofield, general manager of Modern Warfare 3 co-developer Sledgehammer Games, also responded to criticism of the IW engine, telling us "this thing is Porsche", as did then-Infinity Ward community manager Robert Bowling, who told us that, "speaking hypothetically and from a top-line philosophy", building a ground-up engine for the series would be "counter productive".

The list of Black Ops 2 Achievements was recently revealed. There are some potential spoilers in there, so avoid them if you want to stay clean ahead of the Black Ops 2 release date of November 13.