Honestly, I just disagree. They made difficult, the most important aspect of any fps: the actual aiming. And it's not just difficult because people have played COD, it's difficult because they wanted it to have "weight". I didn't play Killzone 2 for a real world simulator. It's not that, and it should recognize that. Also, that's not how guns move in the real world either. There's a lot more to aiming than just weight. It's not realistic, and the fact that the devs pretended so is bullshit.
No, people don't move as fast as they do in COD, but most certainly they do not move their sights like they do in Killzone 2. There is no deadspot in real life. If I apply a force to move my weapon, it moves. IT MOVES! Yeah, they removed it with high precision, great, but it's simply not true that a deadspot exists. I understand the acceleration, but it makes for a less fun game. When aiming is a chore, it's no fun. I'm not going to spend 10 hours learning how to aim, when that's the length of the campaign itself.
It's a horrible design decision, and the people who came up with it should never get to suggest these ideas again. The simple fact is that it made the game a lot less fun, for people who otherwise would've liked it. And it really appealed to who? The large majority of people who bought it and complained? I doubt it. I'm glad you enjoyed it, but this "weight" is bullshit and makes the game worse for just about everyone.
High precision helped, but my intial frustration with aiming made me give it up 6 hours in. I do have to say though, that I really did enjoy playing multiplayer. Lots of different game modes, as well as features. Too bad there's like no one playing and I bet the aiming is a big reason why.
If you wanted to create a good alternative to COD, that people on PS3 could play, this is not it. Close, but they messed up the most important part of the game. Stuff like this is exactly why xbox has a larger multiplayer environment. These ps3 exclusives cater to niche stuff like "weight" instead of targeting a larger audience.