I found Stun helpful throughout the game.
Survivor's Instinct will slowly heal your character, if you have skill points you don't know what to do with. It isn't enough to help during combat, but can top up your health when you go drop off loot, or trade, etc.
There is a survivor skill Know Creature that shows NPC stats when you mouse over them (up to a character level 10 times the skill level); level 5 shows the resistances.
Playing straight melee, though, it is unnecessary, and when I tried it, just found that it cluttered the tooltips.
