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One of the memorable moment when I'm playing CoD4: MW, is when I got to be a sniper, crawling opposite direction of marching armies. I died gazillion times. Guess I never cut to be sniper am I?
The A.I.? They're great, moving like a team with their cool C.Q.B. techniques.
The cinematic, they are almost life-like and it's fast paced so no time to take a piss! And Captain Price, you're suppose to be really, really, really old!
Wait a minute, there's a few unlockables I'd like to mention, as far as I got (I only finished playing with Recruit difficulty setting, geez!), There's Arcade and Epilogue. Go figure it out yourself. Buy it or play at your friends house or cyber cafe.
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Here's the spec:
2.4 GHz dual core or better is recommended
1024MB RAM (2048MB for Vista)
3.0 Shader Support recommended. Nvidia Geforce 7800 or better or ATI Radeon X1800 or better
Checkout it's website.