Yeah, it's only really worth it when you can fit enough scopes on both so that your initial charge time isn't complete ass. Then it gets much better once you can fit on all your crazy barrels and magazines.
Once you have enough weight capacity for it to not be an issue, it's still debatable whether dual smg's is better than single smg+magazine case. Correctly selected ammunition makes a huge difference and one smg will always have higher stats compared to the average of two smgs since one is always slightly inferior to the other. But two drum magazines puts out a shitload of bullets...
I dual wielded smg's in my first playthrough then used single smg/ammo in my second playthrough since weight is a pretty huge issue at low levels. You should pretty much always dual wield handguns, though.
Once you have enough weight capacity for it to not be an issue, it's still debatable whether dual smg's is better than single smg+magazine case. Correctly selected ammunition makes a huge difference and one smg will always have higher stats compared to the average of two smgs since one is always slightly inferior to the other. But two drum magazines puts out a shitload of bullets...
I dual wielded smg's in my first playthrough then used single smg/ammo in my second playthrough since weight is a pretty huge issue at low levels. You should pretty much always dual wield handguns, though.