The same system that World at War was written in.
However, Infinty Ward made Modern Warfare 2 and Treyarch made World at War.
Whatever engine they use, I'm sure you couldn't convince them to "borrow" it.
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No he doesn't do a voice in Modern Warfare 2.
There are no golden weapons in Modern Warfare 2.
mw2 platinum is platinum
The Call of Duty Reflex Edition was the first Modern Warfare game for the Nintendo Wii and is not a Call of Duty Modern Warfare 2 although it was released at that time
to date modern warfare 2 has made 750 million dollars :)