Hey FreebE, glad to see you put that much time in the game already. Here are some comments:
FreebE wrote:
-Being on different levels of elevation is crazy. Even if you have the high ground and a clear shot, you can shoot for days and just miss.
Not sure what to say about this, obviously it depends on distance and choice of weapon too, but I think you aren't using accuracy to its full potential. Crouching will improve your accuracy, going prone even more. Also avoid sustaining shooting too much, the spread grows quickly.
Also note that if you're overburdened (you've got a visible backpack), your accuracy is going to be horrible with any stance.
FreebE wrote:
-Certain rifles are OP as fuck (Cough AK cough) and some just suck (PKM-M240).
You kidding?

M240 is my favorite weapon, the ultimate killer

PKM is deliberately worse than M240. AK47 and G36 are fairly on par I think, I'd guess most people think G36 is better than AK47.
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-I don't know if I'm using the snipers right, but I can't hit the side of a truck with those things. Even being completely still.
Use crouch and prone, that's the key. I'd concentrate on taking out targets that are coming my way or being still, sideways moving targets are difficult. M24 is better in terms of range than Dragunov, with the expense of lower rate of fire.
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-Shotguns can rape from sooo far away.
I somewhat agree here, they used to have even more range in the past.
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-Knifing sucks.
How?
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-Other than the Law, there's no way to take out vehicles, though they aren't much of a problem so far.
Grenades, tanks, TOWs.
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Some stuff I liked to see:
-Side arms, being able to quick swap to a pistol (maybe have to drop your primary for a quick swap, but you can still normal swap)
Most likely won't happen.
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-How I was killed / Who I killed
In online this is shown at the top right area of screen, textually.
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-Being able to quick pick-up items off the ground, instead of having to hold F and drag them into my bag.
Tapping pick-up will swap the item with your existing item of the same type, except put valuables directly to backpack. If the item can't be equipped (like in Invasion, you need higher rank to unlock certain weapons for equipping), it won't swap.
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-Global chat box, when you talk it comes up in a box for allies to see, instead of just being able to talk to people around you.
That's how it works. You just don't see your own message in the radio queue (top left), but others do. F1 also shows the log.