Melee weapons never leveled up. Melee weapons are not guns, their swords, axes, knives. The DLC you criticized for not having the ability to level up guns does not have guns.

And if as you say it's changed now, then your review should change @Dragndance

Thats because of a rework changed the way weapon levelling worked. Now the guns are just skins, but before when I made that review, they were premade guns you couldn't level up or put attachments on.

Hey bro! Add me pls