Ender, I can agree with that too. Alongside the fact that the mod seems really unbalanced.
But hey, it has a good concept actually; creating good items from useless materials, but that can be changed to something like:
True copper shortsword idea, making a useless item into something useful For a set amount of time, it also preserves the item from the start.
Making the pwnhammer into a faster hammer with a few hallowed bars and souls of might.
Turning the Gungnir into a long, high-knockback, post-plantera spear with a few chlorophyte bars, ectoplasm, and a broken hero sword.
Upgrading the terra blade to a 170 damage sword by adding luminite bars, and several celestial fragments and terra souls to make a "composite" terra blade
Just to take text from the OP:
"This mod adds Weapons based on useless items, like silt,slush and even grass."
First off, what about a gun that fires the projectile versions of silt and slush, making them piercing ammo that can kill several bosses early on. Much like the snowball cannon firing snowballs as ammo. It'd deal slightly more although since the ammo isn't as common. It'd be much like a sand gun but stronger and has a shorter area of range.
Dirt can be used, in conjuction with terra souls, dirt rod, and fallen stars- to make a rod that fires dirt projectiles. It'd make a great post-EoC weapon although.
Terra souls can be used as a base material for any dirt-based item.
Back to the dirt items, you should implement a Dirthrower, which would be made from a flamethrower, terra souls, a large amount of dirt blocks, and 10 souls of might. It would constantly spew dirt projectiles that deal constant damage. Much like the sandstorm from avalon.