I'm saddened there's no expansion or DLC to copy what Project Reality offers. I think there's money to be made in making PR style gameplay more accessible in BF3. But Armored Kill might be fun for a while. The Karkand maps are amazing and might save the game from oblivion.
I however can't play BF3 for more than a round or two due to the constant visual blurring, shaking and other effects. It's just too much and it's hard on my eyes because they are trying to focus it out but it can't be. The game gives me visual or a sort of motion sickness because of the over-the-top visual feedback effects.