It's definitely pretty easy to get trapped on the black ops rifle because of it's reliability in its snap shot overwatch spam but it just lacks the pen and damage like others said I think notable promotion 3~ weapons would be
- BlackOps Macro SMG
One of the few heavy guns with a Cqc bonus, dose 40 damage, a decent bullet spam in Cqc on weaker targets, is sadly two handed unlike black ops SMG
- BlackOps Smartgun
35 damage .85 armor mult able to put out 10 rounds at a long range fairly accurately, this gun is also a decent overwatch gun with its snap fire / auto fire range
- BlackOps Auto-Sniper Rifle
This gun is very stat dependent but on 100 aim it's 50~ damage
With .75 armor mult. It has burst potential, Something you put on your best aim and reaction soldiers
- Heavy Machine Gun
Imo my pick for most op gun ( better then miniguns overall imo) because how early you get it
55 damage .85 armor mult 10 shot burst, 100 range
Trit ammo is 70 damage with .85 mult (one of the guns i go out of my way for better ammo) , this gun pairs well with black ops smart pistols in quick holster, basically needs all your tu to fire and a strong soldier but is nearly allways a guarantee kill at long range, you can try to set up 2 shooting way points for multi kill or nuke one target
- BlackOps Assault Cannon
45 damage .75 armor multi, needs a quick draw side arm, is generally a worse auto sniper but it's not stat dependent. A gun to give to lower tier soldiers who just barely got the bio enhancement
- Recoilless Gun
125 damage with .6 armor mult, has a 100% acc aimshot for 75% of your units, it's ment to be an AT weapon but it has 50-150% random damage unlike 0-200% so it's can be a very reliable humanoid remover
- M82 Barrett
70 damage with .7 armor mult on 100 aim soldiers, Is aim skill dependent and needs a lot of TU to fire
Btw I think there's Several ways to play the game, that's why I return back to it every year but I feel like the bio enhancement is near mandatory