Call of Duty 4: Modern Warfare is a classic first person shooter. The aiming / targeting system takes place through the eyes of your character. When you decide that it is time to aim the gun, it gets brought out of it's default position, chest level, raising it to your character's eye sight level to help you aim better as well as more accurately. If you were to change the camera system it would not only not allow you to see the enemy very well it would hinder your ability to focus in on your target.
One of the other major problems that would be effected would be your ability to sneak. This is a key element in the success or the failure of finishing this game it also just makes it more fun. Your ability to sneak up on an enemy would be greatly hindered, also this would effect some of the larger game mechanics involved with the creation of “Call of Duty 4: Modern Warfare”. If this game were built in the 3rd person view it would be impossible to sneak up behind the enemy and knife them or get the critical head shot, because they would see you coming, turn around and kill you. There is a map system that is in the upper left hand corner that shows the enemy location. People that are good at this game know where the other team is and are able to move around enough to no get stabbed in the back. People that are new or like to “Camp” and stay in one position at all times are the easy targets for better players. When you throw in a UAV jammer (map blocker) it causes serious problems for people that only watch the map, making it a critical game mechanic.
Call of Duty 4: Modern Warfare is one of the best first person shooter games I have ever played. It gives Halo 3 a serious run for it's money. I hope that the control system / button layout will be used for many years to come. It is a fantastic accomplishment for the the next gen consoles.
This is a PERFECT example of not watching out for other players. If this was in 3rd person they would know you were coming.
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This video is a good example of UAV Jammer as well as watching the map, notice the top left hand corner and the red dots.