the statistics on that chart are directly from the game code, literally right off the disc. I dunno how you came up with the AUG being the best, the ak47u has the best setup going by the stats - something else a fuckload of people have been bitching about the ak47u needs to be toned down.
Let me explain by comparing the 3 guns: AK74u, AUG and Commando. Every soldier on this game has life = 100, so the damage that matters is how much bullets we need to reach 100 or more.
AK74u
3 bullets to kill until 20m (3x40 = 120)
5 bullets to kill after 20m (5x20 = 100)
RPM: 750
Reload: 2.1
MagSize: 30
ADS: 0.2
AUG
3 bullets to kill until 37.5m (3x35 = 105)
4 bullets to kill after 37.5m (4x25 = 100)
RPM: 937.5
Reload: 2.6
MagSize: 30
ADS: 0.25
Commando
3 bullets to kill until 37.5m (3x40 = 120)
4 bullets to kill after 37.5m (4x30 = 120)
RPM: 750
Reload: 2.05
MagSize: 30
ADS: 0.25
The ADS from all the guns are somehwat a draw. AK74U has a small advantage, but nothing serious as they all have fast ADS (specially with Sleight Of Hand Pro, that cuts the ADS time time by half).
Magazine: The magazine is the same for all weapons (30), but it´s more problematic for the AK74U as it needs more bullets to kill at distance, and this problem is even worse when we realize that the accuracy of AK74U is bad, so you waste more bullets until you nail the 5 necessary.
Range: Range is the distance that the bullet needs to travel to have it´s damage reduced. AK74U has almost half (20m) than the ARs (37.5m), and its bullets gets weaker than the ARs (needs 5 bullets to kill at distance instead of 4)
Reload: Commando and AK74U both have the same reload time, that´s pretty quick. AUG has a longer reload but nothing drastic, specially with Dual Mags and/or Sleight of Hand (cuts the reload time by half, or 1/4 if you use both).
RPM: How fast the gun can shoot. AUG has the upper hand here. If it shoots faster you can nail the ammount of bullets necessary faster than the enemy. This is what makes M60 terrible instead of great.
Recoil/Spread: It´s the accuracy. How much kick the gun can produce to each direction after each shot. More important that how high the numbers are, is if they are simmetric. For example, FAMAS has less kick, which was supposed to be good, but the left side has much less kick than the right, so when you start shooting, the aim will start to move to the right making it much harder to follow the target. When the recoil pattern is simmetric, each shot kind of compensate the kick of the earlier, so the aim doesn´t move too far away.
By that chart AUG and Commando has the exact same recoil, and AK74U is slightly different (but with the same simmetric pattern). If that was true, AUG would be the better gun, as it would have all the benefits Commando has over AK74U (strength, range, etc) but with a better RPM. But that´s not the case, because the recoil info on that chart is wrong and I can show below with screenshots that I took from the game. On each screenshot I lock the aim at the same spot (the left gap on the painted circle) and unload the whole magazine. The AK74U marks on the wall are a bit harder to see because the SMG bullets are smaller, but they went up and left.
AK74U
AUG
Commando
See how Commando has a much better accuracy (by the way, AK-47 is almost identical). This accuracy makes Commando a much better gun than AUG, even with less RPM, as it´s easier to nail 3 bullets with low RPM and great accuracy than the opposite. What´s weird is that with the Grip attachment, the AK74U accuracy got even worse than without it (!!!).
Now let´s see hipfire, where the SMGs must shine. I´ve used the same method, but aiming (no ADS) at a closer target, one that I would hipfire on the game.
AK74U
AUG
Commando
As you can see, there´s much less difference than it should between SMGs and ARs hipfire. Once again AUG´s faster RPM doesn´t really count as it misses much more bullets than the other guns. AK74U was good, but went a bit up and right. Commando wasn´t as tight as AK74U, but kept the spread on a small circle space where an enemy would occupy. With the same RPM and strength (at this distance).
If you take all of this in consideration, at least to me Commando is clearly the winner. The only advantage AK74U has is the base walking speed, but AR´s speed isn´t a big problem like with LMGs. I don´t think it makes up for all the other factors, so I believe Commando is the best all-around gun.
ps: wow, that was nerdy.