I agree ATR. While Joint Operations sucked, the realism was second to none. With the sniper, you had to take your binos and scan the target area to get an approximate range, then zoom your scope appropriately. Very cool.
One thing I am REALLY SUPERLY DUPERLY hoping for, and it's probably way too late in the game for AA (maybe, just maybe, OFP2) is the ability to hide in grass. You couldn't do this in OFP. I am a big stealth guy, and you can do this wondefully in very "old" games like Ghost Recon (which I still play). Hididng in some grass or a bush concealed you from a patrol. In OFP, they still see you, but you can't see them.