While talking about Modern Warfare 2, I figured out why I'm not 100% sold on this game.  If you've played a Call of Duty game before you know that the game likes to put you in the shoes of several different playable characters.  In Modern Warfare 2 you'll play as either a US Ranger or a elite soldier in Task Force 141.  In my opinion playing as the US Ranger completely sucks and all I'm doign is hoping those missions will end soon so I can be the kick ass British guy in Task Force 141.
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n Task Force 141 you play as a bad ass British soldier infiltrating Russian bases, taking over oil rigs, fighting your way though Brazilian shanty towns and sneaking your way through a Afghanistan base built into the mountains.  The US Ranger missions have no real connection to the main story line and are used just to throw you into action heavy firefights.  The only cool mission in Modern Warfare 2 for the Ranger is the very last mission which is surreal.

The first Modern Warfare was exactly the same with the Ranger missions having little importance to the game's story.  The stars of the game are really just the British special agents which are the ones fighting the real enemies in the games that are pulling the strings.  The game's graphics are so good that it's action stands head and shoulders above the Rainbow Six and Ghost Recon games that have dominated this genera.  In Modern Warfare 3 I just hope they have more missions fighting as the former SAS members than the US Rangers.