Call of Duty 4 feels a bit underwhelming..

It's satisfying and great to see us smashing through the North Korean army,
but the way the Zhukov's forces get wiped out is just too easy.
Of course, even in real life, we would have crushed them,
but still, it's a bit much.
It makes me wonder, "If it's going to be like this, why did they even invade?"
There's no mention of China or nuclear issues either.
It feels a bit lightweight.