Blade is a weird topic. I acknowledge the fact that it takes good skill to master the naked Blade. A lot of time have passed since the release of the game, and people have learned that hearing “Ryuujin no kure!” immediately means 6 people should hard focus the Genji.
There are just so many ways to screw Genji over. From support ult counters like Trans and Beat, to screwing up his dash reset by denying him the kill (like booping him away, escaping from his reach, Zarya bubbles, or using a CC tank ult like Shatter, Grav, Flux, or Whole Hog), to hard CC comboing him to death (Sleep dart, McCree Flash+Fan, Hog hook etc.)
As Genji, you have to keep track of a lot of abilities and enemy positions before thinking about popping Blade. People have to realize that the moment Genji’s ult voiceline comes up, 6 people will do their very best to make Genji’s life miserable.
HOWEVER; Blade is a contender for the best DPS ult in the game, along with EMP and Replicate. Most people associate Blade with Nanoblade, and while technically not the same, a lot of the times Genjis get nanoed during blade. This SIGNIFICANTLY increases his lethality and the swiftness of his movements to secure at the very least 3 kills, while also increasing his survivability such that many methods that could counter baked Blade simply no longer work with nano.
It is to no surprise that you see many complaints about nanoblade, because in a not so coordinated environment such as ladder, Nanoblade wrecks havoc.
No one thinks that Visor requires intense mechanical skills. The reason Visor is regarded as a trash ult, is because the amount of things that can just counter it, outsustain it, protect from it, ruin it, or straight up ignore it is uncountable. I could list the entire list of Blade’s counters, and that would be about half or slightly less than the amount of things that could screw up Visor.
It is extremely difficult to get value from Visor, much more so than Blade. Many people actually see it as a nerf to really good players because it doesn’t allow them to score any headshots.