I don't think the "lag" is a technical problem. I think it's just the implementation of the controls. Aim mode seems to suffer the worst for it, but there is definitely a lack of sensitivity to very fine movements of the right analog stick. When you have the game sensitivity set very high you easily over steer or overcompensate for the lack of responsiveness to fine gestures. People can say its "weight" all they want, as if it's some realistic portrayal of physics, but it's not. If you've ever fired a gun you'll know that pushing on a stick is nothing like holding a gun and can't realistically reproduce the motions of aiming, tracking or switching targets with an analog stick. I'm sorry, but this supposed pursuit of realism is just a bad design choice. It doesn't feel good and it doesn't respond well. I'm sure a lot of people will like it (no idea why) and other will adjust to it, but if they went with a more generic approach pretty much everyone would be happy right away. It isn't so bad that I can't play the game. In fact, the demo is incredibly easy, but when I touched the controls I immediately felt as if something was "wrong" and I think that's worth highlighting to a lot of people. There are a lot of people complaining, maybe still a minority, but I don't think its an issue of their tvs. And trying to write off people that don't like the controls as Halo3 or CoD players is petty. There's no reason to get so defensive about Killzone2. For one thing, it isn't an insult to have liked or played either of those games. I liked one and not the other, but I'd say they both feel a lot better than Killzone2.
It is, if the video provided as proof is true. I don't experience ANY of those problems. If people don't like the weight, that's fine. But to show a video that shows firing occoring quite a while after the button is pressed - and saying this is a problem with the "weight" then you're wrong.
The controls are responsive and accurate once you get used to them. Honestly, it is a joy to play. Even the Edge review that gave the game it's lowest score, said the controls are tight. TTP and myself and other people with the retail game, do not have these problems. In fact noone I've spoken to that has the full game, has not experienced it either.