I'd...disagree with all of this. First, the carbine is the best overall gun and it's unlocked at the start. If you're at level 30, that means you don't have the CAR smg and you're saying the first smg is the best gun over the others? I don't think so..
The beginning sniper rifle is actually pretty good. It only takes 2-3 shots to the body or 1 shot to the head, and once you unlock the AOG scope things become much easier.
the smart pistol is probably my 2nd favorite gun. It used to be better during head to head combat but they nerfed the damage it does when you don't have a lock...which means you pretty much always have to have a lock to use that gun now. The key is to wallrun alot with that gun. I'm gonna play right now...i'll try to record a few clips.
Of course you'll disagree, you're obviously a fanboy