For the grenade launcher, you adjust your aim when in iron-sights with the mouse wheel... it's spot on... I actually really like the ballistics I think it's perfect... you have two "stances" you can move it, regular and tactical, move in tactical if you want more accuracy... also, for the accuracy, you steady your breath with the space bar I think... do that and the accuracy is crazy good... but you won't do much damage to the chest because everyone is wearing ceramic armor, go for the head it's a one-shot kill!... use the mini map to determine if a contact is friendly. I've never seen the fog of war yet but I haven't played ranch yet... I'm guessing it's your settings but maybe not. They finally fixed the training bugs, but make sure you check your firewall, router, and install the AA3 patch they released. I also run the game in admin.
The only problem I get regularly now, is game freeze 50% of the time when connecting to a server... but I think that's the servers' fault cuz it's only certain ones.
I haven't played with the saw in game yet so I can't comment there... it didn't "feel" right in the training thing, but they supposedly made them all perfectly realistic. So I dunno. =P