So after about 10 hours of BF3, I have learned a few things about War and War Strategy.
1. The PP-2000 is the greatest weapon ever made. It was not actually made by man, but rather gifted to man by the gods themselves. No matter if you are running, jumping, falling, blind, deaf, dead, retarded, or otherwise susceptible to gunfire, as long as you can get (maybe) one round of this baby off you will be good to go. It also fires at roughly the speed of light and is accurate up to 1 Mile.
2. The back of the battlefield is the most strategically relevant part. I, like most, thought the front lines of the battlefield was where most of the action was to occur, but in fact, it's the back. The further you can get from the actual objective the better. Also, if you're in a squad with others foolish enough to go for the combat objectives, make sure to stay as far away from them as humanly possible, so they don't get confused and think you're being productive.
3. Despite what you may believe, when being fired upon, rounding a corner will not prevent them from killing you. Apparently the movie Wanted was less of a mediocre piece of crap and more a documentary on the mechanics of bullets and firearms. Just because there is several inches or in some cases feet of concrete between you and your enemy, YOU ARE NOT SAFE.
4. Nobody in the Military can stand. Apparently the entirety of the US and Russian military is incapable of standing, let alone running. They prefer in fact, to lie on their bellies in as dense of brush as possible (see point 2 especially). They also prefer to exact their vengeance across any "Walkers" by occupying the most strategically relevant places and making them otherwise impassable.
I have several more, but these were the most notable things I learned while playing this "Super Realistic" First Person Shooter.