You know what else can kill in 2 shots?
the FAL, SMR and the MK48 (with a headshot)
all have larger ammo capacity and do not suffer the cons of a sniper rifle.
True, but then you have to use Adjustable Stock to actually make the MK48 actually usable since ADS times are longer than sniper rifles.
The size of the maps in BO2 make view distance almost worthless
all these weapons have:
Better Hipfire performance.
Higher ammo capacity.
Better CQB abilities.
Iron Sight and other Optics for better map compatability.
The capability to have Quickdraw and Stock allowing for better Mobility.
The fact that the SVU has a scope (with adle sway) does not even come close to matching these, also whats it matter if the SVU can hit you with 2 rounds in rapid succession any other sniper rifle would have killed you with the first hit = fatser TTK anyway.
Un-ADSing shouldn't be too much of an issue but I guess it's more situational and depends on your playstyle I guess. LMGs suffer damage drop at range (where they are supposed to be good at) and they also don't have fast mags available (a non-issue for me but it's a noticeable omission nonetheless). And I'm not sure LMGs do not do a snipers' job better (I use both weapon types). Try using the QBB LSW to pick off snipers at long distance on Drone. In previous games I have never experienced such issues (excluding WaW because I never used LMGs there).