It does work "fine" but mathematically it is most effective at reducing damage when combined with a shield. It is mathematically more powerful when your AC is higher.
True, if you can keep their attention.
Sure it works any Finesse, which means you can use 5 of 20 one-handed melee weapons,
Don't darts also work?
Get sharp shooter and you can use it in melee.
or 3 of 8 light melee weapons if you also want to dual wield. It limits your weapon choices, which is what I said.
It works with every martial Nick weapon, and the best simple Nick weapon.
If your dual wielding, it doesn't need to be your primary weapon. Either one works.
And you can still attack with Str.
The only thing that doesn't work is the Crusher feat. (Edit: or Shillelagh) But you can still dual wield
On a Monk it competes with deflect attacks and as with other classes it dramatically limits monks to 3 out of 13 Monk weapons.
It's still an upgrade for Monks.
0 damage is better than damage reduction. Plus a chance on future attacks to miss.
And if they roll really high, Deflect attacks will still work.
Also monks damage scales, so doesn't matter what weapon they hold.
Not as big of an upgrade as it would be for someone without a reaction (Paladin, Fighter) , but still better.
I can't think of a single build where a Monk would want this over another feat, and if he is going to be a weapon user Weapon Master (for nick) will almost always be better.
Depends if they want to go.
Shadow monk with 23 AC, in darkness, with an alternative defense isn't going to be hit much. Grapple an enemy and they won't hit anything.
Bettet than +4 damage once per turn, IMO.
On a Rogue it competes with Uncanny Dodge.
Same as monks.
0 damage + lingering buff is better than half damage.
I am not sure the juice is worth the squeeze though compared to other feats.
Not at low levels. Being missed by 2 isn't going to happen very often.
But as AC scales, and multiattack comes into play, it's ability to help improves.
A monk can grab weapon mastery at 4, grappler at 8, and defensive duelist (+4 AC) at 12 and get 20 Dex for instance.