I've skimmed this topic over a few times and saw a few notable points. And to be honest...
WoF:
I think any rational person would agree that WoF is in fact the most underwhelming passive skill in the entirety of the game yet it still hasn't been addressed in full as to why that is. Aside from the unreliable RNG mechanic, You have to wait a full 10 seconds usually before you get back up. Which in all honesty, means nothing when the enemy can just camp your body and place a stationary jutsu such as tags and/or firewalls on top of your body to ensure you die instantly if you were to get back up. The counter argument is that it's supposedly clutch in raids however with the vast amount of crowd control the other villages possess, whether that be from their buff (Grand Puppets and Seven Swordsmen) and/or their village specialties (Wind Tornado's and Stationary Bubbles), you'll find yourself caught up yet again in the chaos of battle. Not to mention you have to also account for the the lag that comes with heavily concentrated maps and while everyone if usually affected, the puppets, in sands case, are still usually still in motion. Even in a 1v1 scenario, the passive literally does nothing but prolong the inevitable. Reviving at low health with no chakra is a bit overkill, you're just flicker or homing away from dying again.
Overall:
Nin is in an era where the majority of players travel in packs, which surface wise there's nothing wrong with... Excluding the fact leaf doesn't have much to utilize to repel, let alone compete with opposing groups. Other villages will claim that leaf is disorganized, which at times can be true however there isn't much you can do whenever narrow maps are littered with Grand Puppets that all have high damage output, backed with shinobi who all pretty much have a 3 tile wide tornado stun or 3 clams stunning ninja upon entry to camped maps for a barrage of ranged attacks that if you sub, you'll run the risk of being chained into a bubble stun. Leaf has no such utility. Sure, we could go to Sand, Mist, Takumi, wherever and attempt to place a bunch of slugs that barely fulfill the role they were designed to do, to serve as our "stun mechanics" or "heavy damage dealers" at the entrance and see where that gets us. That said, its not so hard to cop kills from leaf by camping Dark Bridge. In fact its such an effective method that's all sand and mist would do. Majority of that isn't skill, its just lack of balance.