At least you're not some Fate fan who instantly thinks they stomp everyone, but I have to ask: why do you think Hassan would accidentally run into Nagant while running away? You sure that's what you want to argue? Does he have some fate hax that lets shit like that happen that I'm unaware of?

This is Spacebattles, pretty sure he has to hide his actual thoughts to not get ostracized...
Also, yeah, Cursed Arm is the weak link... but the weak link in a team of Servants that would realistically crush everyone on the list without trying... is he truly a weak link or just meh due to that? Also yeah, he can unironically kill God Realm and/or anyone who uses explosions/shockwaves due to how his Wind Protection works.
I looked through the Shounen team again and because of the whole enough mana (or in this case a equivalent) can resist its affect, it doesn't take out nearly as many people out as you might think. I thought about her petrification, but I totally forgot its requirements making it so it takes a few characters out right away. I will get to who I think dies when the fight starts at the end of my comment.
how strong are those again? like building/city block level?
Again, Salter was hooked to someone who was the equivalent of a walking Holy Grail and augmented to the point of a Grand Servant. Medusa was still able to basically cripple her for a moment before she overclocked her Mana Burst to get out of it.
Everyone in this team is nowhere near close to that level of energy... but this is Spacebattles again.
They consistently cut skyscrapers, buildings, bridges, and so on in half with a single dismantle even when while nerfed, they also damage characters who scale to or above the Yuji that survived getting punched through a skyscraper and got right back up still in fighting shape. That is something the servants can't handle if they're limited to FSN feats.
Now that's an absolute lie if I have ever heard one...
My dude, most of the major feats seen in the anime alone dwarf most of the feats in JJK on site ALONE. Yuji isn't anywhere near Servant tier unless you stretch the ungodly fuck out of the shit he did and that doesn't change in the endgame of the series either. Again, why do people act like Yuji being horizontally punched through a Skyscraper or two is meant to be "omfg look how durable he is" with no other basis to it?
Shounen Team:
6 paths of Pain: Survives
Megumi Sukuna (JJK): Survives
Post rose meruem (HxH): Survives
Makima (CSM): Survives
Muzan (Demon Slayer): Dies from petrification (not like he would be much help anyway because the moment he realizes he might die, he runs away)
Lady Nagant (MHA): Dies from petrification
Crocodile (One Piece pre timeskip): Dies from petrification, Boa Hancock mere existence proves this.
FSN servants:
Artoria: High chance she dies from dismantle unless her instinct decides to kick in and save her and not fuck her over.
Medea: Dies from dismantle
Medusa: Dies from dismantle but not before killing at least three members of the other side
Cu: His POA probably saves him
Emiya: 50/50 since the dude does love to fight in CQC for whatever reason
Berserker: Loses 1 or 2 lives but survives
Assassin: Dies
Kojiro: Dies
Gilgamesh: 50/50 he can escape, but he's also a jobber, especially this version
This is literal fucking fan-fiction level of theory baiting here...
Especially when you acts like that Artoria will die from a Dismantle when girl lived from Heracles being able to tear her damn near in half and his swings can fuck with space... but somehow, Nagato and the 6 Paths can survive a Medusa's Cybele based on nothing as can Makima not get fucked over by anyone else(again, what's stopping any Heroic Spirit from just eating her soul? love they act like people have to die for that to happen when that's been proven false many times).