Call of Duty: Modern Warfare
Some REALLY interesting multiplayer features to this one: (note that these are like unlocks – per player, and not global)
PERK 1: Last Stand:
While in Last Stand, you’ll be firing your side arm from the ground with one hand. Putting up one final last stand against the enemy before you bleed out, or they put one final round into you.

Check out the full article [ HERE ] (requires you to register)
PERK 2: Deep Impact:
Wherein your bullets can/may go through some types of cover, based on the weapon power, range and distance you are from the cover.
That said, what you can shoot through depends on three main variables:
- The Ballistics of the weapon you’re using.
- The relative ‘thickness’ of the object you’re shooting through.
- The distance between you and the object you’re firing into.

?Ǭ†Check out the article [ HERE ] (requires you to register)
PERK 3: Double Tap:
Double Tap is pretty straight forward: put more rounds down range quicker, because with Double Tap enabled, you’ll have an increased rate of fire on any weapon you have, including your pistol.
The Double Tap perk is ideal for the Flag Runners, Run and Gunners – i.e. the guys who want to get into battle quickly, and wreak some havoc. It’s also perfect for CQB and interior fighting. Keep in mind though, every perk has its pros and cons. If you choose Double Tap, you’re going to have to miss out on something else…
Check out the article [ HERE ] (requires you to register)

Excellent! Imagine a battlefield where you dont know exactly what the other guy is capable of. Put em down and turn your back only to take a clip full of lead in the @$$ from his side arm! Finally a reason to do kill checks
Balanced squads sound like they will win the day!