Here's The One Everyone Should Play
The game begs for exploration, rewards the bold and punishes the foolish.
Quests are plentiful, easy to grasp, fun to complete... seldom do you get the typical "FedEx" quest, and the ones that do ask are designed to introduce you to a new main character or city.
The record breaking Steam online player count which tripled the turnout for MW3 reflected the popularity of this series, and the fans were rewarded with a world that it very tough to leave... food, sleep, friends, forget it.
There are some bugs and you'll be the victim at some point, so save often and keep a good history of previous saves in case you find the need to revert.
Finally, if you do have a problem with the game (mine crashed hard on the intro 3x until I made these changes) I have few simple suggestions:
Turn off AA
Turn off V Sync
Do this in both the game options and your video card settings.
I have now played for over 40hrs without incident.
There is a new patch promised, but the word is Bethesda is taking their time, so you are stuck with the current version for now.