On sound.
I've given the game some time now and atmospheric sound is great but in MP directional sound is not a patch on GRAW, it makes sooo much diference being able to hear enemies reloading, kicking cans etc and using sound to zoom straight towards enemies completely missing in BF3. Its a pity cos it would add an enermous ammount to a very good game.
Generally I've had a blast playing with our crowd and I would really recommend it just for MP and friends tell me COOP is very enjoyable as well.