It does not, it's just because the damage of the weapons has been improved, so that makes it easier to kill/easier to die. Plus there is no Juggernaught, so if you used that in Modern Warfare or World at War, then you might be too used to it being on.
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Yes, Halo is way better.
it sucks really hard
it sucks because its really unrealistic
No he doesn't do a voice in Modern Warfare 2.
There are no golden weapons in Modern Warfare 2.