Originally posted by NemeBro
1. Show me them ever using Genjutsu from over a mile away. Rare is the ninja who can fight from that distance.
They can get closer than a mile before doing it.
The ninja can leave the village to get closer to them, you know. That the surrounded forest is part of the defense is in the name.
2. When has Genjutsu ever been used to hide an entire village?
As long as it's on the pirates, the size of the target doesn't matter much.
Remember the genjutsu trap in the chunin exam that prevented them from getting to the target? That took a mere three genin to do. Anyone trapped in that isn't getting closer to whereever they intend to travel to.
Only their admittedly more varied abilities would not help them here.
Except for genjutsu and possession and so on.
You pointed to using Haki to deal with ninja, what makes you think that that's useful while the Ninja's far greater range of mental affects is not?
It takes one pretty good genjutsu user to affect thousands (Sound invasion sleepy spell).
3. Why do you assume Kakashi can even perceive the speed Marco moves at? Marco has on-panel reacted to and deflected a light attack from Kizaru, making him one of the fastest One Piece characters, and much faster than anyone in Naruto.
Kizaru's attacks have tells, they don't require moving at lightspeed to handle.
Even if you argue on react times, his *body* definitely does not move that crazy fast. Marco was not effectively teleporting around the battlefield orders of magnitude faster than the low-mach speed characters like Luffy. He himself moves at a speed that Kakashi can target.
I must admit I forget who Fu is.
One of Danzo's bodyguards, the one who took over Ao's body in order to destroy his Byakugan.
His ability is, if you kill a scarecrow he makes, then you end up in the dummy and he ends up in your body.
Shisui's eye is best saved for Whitebeard, assuming Danzo survives the initial attack.
What if he does it before they attack?
It's a home field advantage with prep. They don't have to wait for the Pirates to attack first, they can launch pre-emptive strikes in their home territory.
4. Each one is still a Grand Line pirate. The rank and file of Konoha would not even be able to handle Don Krieg, and low level? Buggy was on the first level of Impel Down, most of the thugs were from higher levels. And marines are not always weak either.
I'll point out that strength doesn't affect mental resistance. Luffy easily falls prey to Miss Golden Week's paint, and many of them specifically were affected by Boa's charms.
Not that being stronger than Buggy is all that impressive. A nice Afternoon Tiger from Gai'll still blow away most of the riff-raff, as would big summons. And many of Whitebeard's rank and file crew fell to Haki, so I don't put their odds of shrugging off the mass sleep genjutsu at very hard.
Seriously, the level of destructive power Whitebeard alone outputs is too much.
And again, if the ninja didn't have ways to make that power not be applied against them that'd be decisive, but there's more to the fight than that and repeating that Whitebeard is strong won't change that.
Power only helps if it can be applied. 10 members of Ino's clan sneak up (perhaps with aid of other stealth-jutsu users, like an underground insertion, and under the confusion caused by genjutsu) and take over 10 of the highest officers they can see. They start wrecking havok in high-end One Piece strength level bodies who the crew will be reluctant to face. Ino's dad makes Jozu start rampaging wildly. Marco or Ace kills Fu's dummy and get taken over. Genjutsu users are making pirates see their own comrades as ninja attacking other comrades. Others get paralyzed in place.
Danzo walks in to the middle protected by Izanagi and Shisuis' Whitebeard.
That's something of a best-case but the point is they have a whole toolchest of what to do, stuff that will work against the pirates. "Get quaked, die," is not a situation that they have nothing to do against.
Power must be directed properly before it matters, and if it can be prevented from being directed, it's shear quality will not win a fight.