Without heavy investment in DEX, the AP cost of SMGs and a rapid Hornet will be about the same. Even with Spec Ops 2x bursts, the overall damage potential of ARs is much greater than that of SMGs. ARs only require one feat to be an awesome secondary. Really, if all you care about is damage, there is no reason whatsoever to use an SMG over AR. ARs are a straight upgrade over SMGs that will also take less investment in this context.
AR is NOT a straight upgrade over SMGs. They actually play very differently. You don't need heavy investment in DEX in order to see a night and day difference between AR and SMG. With 6 DEX and Spec Ops, you can burst a Smart Rapid 7.62mm Jaguar SMG at 18AP, which is a lifesaver as it fits perfectly within the 20AP from adrenaline shot. The fastest possible burst from an AR is 9*3 = 27 AP. SMGs are only effective when you burst at close range, preferably point blank. If you do this w/ special bullets it's pretty much a guarantee 1 burst 1 kill.
BTW, you can also take Kneecap shot if you really want. I did when i played sniper, but i found out that i don't use it all that often - most of the time, it's easier to just kill a guy who got too close rather then fire one shot at him and run.
If that's the case, ARs would serve you much better.
Not true, SMG is the better choice due to the lower AP cost.
With one? Yes. With 2-4? No, it's quite reliable.
It is pretty unreliable regardless. If you expect to kill something with a stray bullet in the burst cone, you might as well just shoot it with a regular shot.
Remember we are talking about melee enemies here, most likely at point blank range, SMG burst is very effective here.
Yes, because unlike pistols SMGs allows you to use at as second main with minimal investment. More flexibility in fighting tactics is never a bad thing.
It's not a bad thing, but the way I play it's redundant. I'd rather start the fight first when it truly matters than get a second damage source that can't accomplish anything the first one couldn't.
It seems like your main selling point of a pistol is accuracy and Kneecap Shot which seems pretty weak to me. A pistol might be more accurate per bullet but you only get 1 shot. A burst fires 5 bullets at reduced accuracy but at point blank range it's mathematically impossible for it to be less accurate comparing it to a pistol shot. In fact, I would say SMG is much more effective due to its high chance to crit (5 vs. 1).
You know you can kneecap shot w/ an SMG right?