Originally posted by xVii
I disagree with you. Just think about it. Would it be unfair, say, if you went paintballing, and someone on the other team had a much better gun and much better equipment than you? Sure, they'd have an advantage, but it wouldn't make it much harder to "kill" them. Is it unfair? No, because they went out, they invested their money, and they are benefiting from that investment.
If IW wants to make part of the DLC guns, let them. If you're worried about people having an unfair advantage, well, its not actually unfair. It's not like IW gave only them the advantage, and not you. They gave both of you the oppurtunity, but you just decided not to take advantage of it.
If IW actually does include weapons in this DLC, there will be a couple of problems. Will players who did not buy the DLC be able to pick the weapons up off of a dead body? Will there be a separate playlist for people who bought the DLC, and they can only use the extra weapons on that playlist?
You're sort of right & a lot wrong. lol

Let me see if I can break this down a bit more.
First off... A company (Activision) makes a product (mw2) that they think will have a value to their customers. The customer has every option to purchase this product or not. Once the customer purchase the product it doesn't assume any rights of the customer to say what the company can or cannot do. This is assuming the company doesn't break any laws.
You're thinking of the make an equal playing field in the game. you're discounting the actual goals of the company. ATVI's primary goal is not to make the product have a sense of equality across all categories. They're primary goal is sales. What drives sales? Demand. A marketable product. By releasing "new" guns and perks they're creating a demand. They're creating an illusion of inequality.
The developers try and make the game balanced. Think about it... there is always a counter to something. There is never a spot you can camp that doesn't have three or four different ways to get to it. There is not one gun that is just over powered without something to counter. Thermal scopes & HBS... you have cold blood and ninja.
Nothing personal... I think you need to start thinking like the company for a second and not the gamer. Think in terms of dollars and cents... supply and demand.