All weapons in this mod perform their functions very well without leaving anything to be desired.

The trench knife is very good for direct melee confrontations and always counter-attacks enemy strikes.
The sledgehammer is the best basic stealth weapon. It kills with 1 hit from behind with any character and despite low hit chances in direct combat, it causes massive damage. When striking enemies, it doesn't perform a knockdown animation which saves a lot of time to hide again.
The battle axe kills with 1 hit from behind and in direct confrontation and has good hit chances.
The poisoned knife usually doesn't kill with one hit but you will always land the strike and poison enemies.

The new weapons are very good and excellent additions!

The Colt is decent and possible to find in piles, being a better utility instead of making common and poor pistols.
.457 Wildey is a great pistol, killing very easily.
Sawed-off shotgun causes massive damage up close and is more useful when enemies are using stairs.
P90 is a mix of shotgun and rifle, being easier to use than the common rifle and more efficient in various situations.
Vector is a more lethal version of the P90.
The SPAS is the best shotgun, able to kill with 1 hit up close and causes great damage at short-medium distances.
FNFAL is a great weapon for situations with enemies at medium or long distances like military.
HK is a better version of the rifle with sights.

If the creator wants to make more additions to this incredible mod, here are my ideas:

Beretta 92, the common pistol but automatic with 3 or 4 shots.
Baseball bat, basic weapon made only with wood with high hit chances and moderate damage.