Sledgehammer Games general manager Glen Schofield has responded again to criticism of Call of Duty: Modern Warfare 3's ageing engine.
"I've worked on a lot of engines over my lifetime and spent a lot of time putting graphics in to them and this thing is a Porsche," Schofield told CVG.
"And what I mean by that is that it is stream-lined, everything in it is perfectly freaking clean. You can tell it's been worked on for years. It's easy to upgrade.
"We worked with engines before that are like fucking spaghetti. You can't work on a part and put it back in without messing with everything else.
"I've said this before - I'm not shipping an engine, I'm shipping a game. So that's why I'm going to talk about the game. You can talk about your engine all you want. It's not fun."
Schofield said that despite utilising the same engine, the upgradable nature of the tech means Modern Warfare 3's levels are much bigger, and have greater verticality, than Modern warfare 2's - on top of graphical improvements.
"If you put Modern Warfare 2 next to Modern Warfare 3 you would see a huge difference. Look at all the character models, look at all the gun models, look at the reflections, look at the water.
"There is so much that we've added, so when someone says 'cut and paste', I don't even want to talk to them because they don't know. They just don't know. They have no idea."
Call of Duty: Modern Warfare 3 arrives on PC, PlayStation 3 and Xbox 360 in November.