I struggle as to why people disregard that majority of the weapons in TF2 are rendered useless on this server.

Scout:
Primary:
The stock scattergun is the shittiest of the them all, he has to be continuously in very close range in order to deal somewhat okay damage. And by okay, it's terrible.
The Back Scatter is unreliable when dealing damage.
The BFB is disabled.

Secondary:
The Flying Guillotine is also bad damage wise. 150 damage for a critical hit, and the critical can only be done using the sandman.
The Bonk Atomic Punch is disabled.

Melee:
The Atomizer and Sandman are the only viable choices for melee, the rest suck.
The stock bat and boston basher are direct downgrades from the candy cane is majority of cases.
The Fan O'War is meant to remove rage, but how are you going to do that without getting killed (you're typically not worth it to be ubercharge).
The Sun on Stick is pointless as melee weapons already deal critical hits.

Soldier:
Primary:
The Airstrike doesn't grant any increased clip size.
The Rocket Jumper is disabled.

Secondary:
The stock shotgun doesn't deal much damage at all, the fire damage only works if there's no pyros alive or other fire igniting weapons.
The Righteous Bison is complete garbage in every way (bison master race).
The B.A.S.E Jumper, we have the parachute already.

Melee:
The stock shovel is a direct downgrade from other melees such as the Disciplinary Action.
The Half Zatoichi heals very little health to even be worthwhile.
The Market Gardener doesn't have a purpose, it's equivalent to the stock shovel (but there is market gardener backstabs on Wliu's FF2 - take it from there maybe).

Pyro
Primary:
The Degreaser is useless. Puff and sting puts the pyro at large risk and the reserve shooter has a fast enough weapon switch.
The stock flamethrower is only good for airblasting, which in turn, builds the bosses rage.

Secondary:
The Manmelter is the worst, there's no advantage to using this unless if you're using the phlog.
The Scorch Shot only pairs well with the phlog for building the Mmph meter, in most other cases it's pointless.

Melee:
The Homewrecker is designed for removing sappers and destroying enemy buildings, in which there are none in FF2.
The stock fire axe is a direct downgrade again from the powerjack.

Demoman:
Primary:
The primaries for demoman are pretty fair.

Secondaries:
The Quickiebomb Launcher is a direct downgrade from the stickybomb launcher as it already has the sticky spamming capabilities.
The Chargin' Targe is pretty bad as all hale damage including explosives and fire break the shield.
The Sticky Jumper is disabled.

Melee:
All demoman melees are inferior to the eyelander.

Heavy:
Heavy is well balanced in general. Except, the KGB and Holiday Punch are disabled.

Engineer:
Primary:
The Pomsom 6000, despite being somewhat overpowered in regular play. It really has it short in FF2.
The Frontier Justice is rubbish for dealing damage, the pistol does a better job.

Secondary:
There's not many secondarys for the engineer.

Melee:
The Southern Hospitality is a direct downgrade from the stock wrench.
The Eureka Effect is disabled.
The Jag is now the new best for engineer in my opinion.

Medic:
Primary:
All of medic's syringe guns are replaced with stock.
The Crusador's Crossbow does grant heal points?

Secondary:
All of medic's mediguns are replaced with stock.

Melee:
The Vita-Saw is pointless, as it only takes away health.
The Solemn Vow is a direct upgrade from stock.
The Amputator does not grant heal points?

Sniper:
Primary:
Most sniper rifles don't work.

Secondary:
The Jarate has a minimal effect on the boss.
The Darwin's Danger Shield and Razorback are disabled.
The Cleaner's Carbine is a direct downgrade from the SMG.

Melee:
The Bushwacka is a direct downgrade as melee weapons already have critical hits.
The Shahanshah in every situation doesn't help, as the sniper usually dies in a single hit.

Spy:
Secondary:
The L'Etranger nerf didn't work as the 1 second cloak time was still treated as the spy being invisible (hence faster speed / less damage recieved).
The Diamondback deals little damage on a crit.

Melee:
The Big Earner is still useless in the gamemode as the speed boost is only applied on kill.
The stock knife in most situations is a direct downgrade from the spy-cicle.

Secondary PDA:
The Invisible Watch after the Gun Mettle update seems a little broken. It allows the spy to move as fast as a scout.
The Dead Ringer is broken.
The Cloak and Dagger is disabled.

Building:
The sappers have no purpose in FF2.

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I didn't want to just complain, but I didn't want to come up with weapon changes on this list or not without any consent. Could the community opt in and suggest changes?

It is kinda true that some weapons have no use in vsh, but it's also true that a lot of players are scared to try new things.

Commenting on every single wep would be tedious and kinda pointless since it's just my opinion, but I guess I'll give my 2 cents about the stuff I like the most.

-Scout scattergun is a viable choice, I'm not very good with scout-aim but the scattergun is strong, fairly risky to use sometime but usually hales don't really pay attention to the scout just shootin at them. On a side note, an ubered scattergun-scout can output more dmg than a soldier, it's just something it doesn't happen often even tho it could work in many situation.

-About soldier and market gardener, explosive-jumping backstabs are OP, giving the possibility to deal backstab dmg on a class that is one with the highest mobility in the game is nuts: soldiers would be able to deal up to 3k with a single goomba to market gardener hit and that's not so hard to pull out, with the parachute it would be a walk in the park.

-Boston basher as well could be used to build uber or boston-bashing jump which can be even higher than FaN jumps but quite hard to do.

-Full support for the razorback savin the sniper from one hit, I think it used to be on the server and anyway sniper aren't a big threat in most maps

I'll be honest, the only weapon I'd like to see buffed is the fan o' war, sometime I like to bash the hale with that thing but it's virtually usless unless you are the last player left, since usually a rocket or two will just trash all your efforts to stop the hale from raging.

I guess that's pretty much all I wanted to say, sure some weapon are junk but sometime are the players that don't want to get out of their confort zone

Yeah, I can agree with you on many. But the boston basher for jumping is definitely not as effective as the FaN as you take heavy bleed damage. And an ubered shortstop scout has more damage output than a scattergun.

1)Amputator and crossbow grants medic points.
2)Holyday punch is not disabled:if u it the boss when u are stunned u remove the stun effect(pretty useless).
What about the kunai?
It grants overheal on backstab but you need 2 backstabs to get over 195 hp(basic hale dmg) .This isn't so good since the boss can still 1 hit kill you even if use the cloak and you will probably die without getting even 1 backstab.