Is Arrow deflection good Witcher 3?
Arrow Deflection is a must-have skill!
This skill will greatly help you throughout your quest, and is useful in many builds, so be sure to learn/level this skill. ... Maxing out this skill will help you a lot against arrows in any difficulty no matter how strong the enemy is.
Are Poison blades worth it?
Poisoned Blades is sometimes worth investing points
The max chance you can get is 35% from using Superior Oils which is still pretty low for battles you can end fast. The ability of this skill can greatly help you in combat against stronger enemies especially in higher difficulties.