There's the CPU Ballistics attachment which reduces recoil. Most of the guns have little recoil but it seems SMGs and SRs are the ones that get highlighted for this. The only way to tell if you can't tell visually with which SR it is would be the sound it makes.
MW3 was a good game for having easily identifiable SR sounds as they all sounded different.
Then taht's more than likely the case. The Ballista has quite a bit of recoil when ADS with a scope, tough zero recoil when ADS with Iron Sights. I haven't used the Ballista w/ Bal.CPU (OH THE LOVELY IRONY) yet so maybe that is the case.
Don't forget that you were seeing that it had no recoil from a killcam. Killcams almost never show recoil of any gun, regardless of actual recoil. So in all actuality, the ballista does have recoil.
they are fine this time around. my only issue is ADS speed is too quick. should be closer to LMG ADS speeds.
as for power and QS reduced to dragscoping, it is fine.
I personally think they are all fairly balanced. The only one I have a problem with is the RoF on the SVU. Needs to be tweaked just a hair.