It really irks me that I do the same exact action executed the same exact way but because of dice roll the game will decide, hey, you know what? Forget you. You don't get the paralyze or whatever else I'm rolling for. Didn't someone once say that insanity is doing the same thing over and over and expecting different results? o.o ...
This is the problem. It isn't you doing the action. It's your character that's doing the action. And as such, your character might have a chance of failing even if you don't. You're roleplaying by taking the role of the character- that means the character's abilities and skills. If it was based around the player and not his character, it wouldn't be roleplaying at all.
The percentages are a representation of chance. If I roll a dice, don't I have a 50% chance of getting a 4, 5, or a 6? In this case it's also to simplify an overcomplicated action. If my character attacked someone with a sword, the amount of damage done would be related to the speed of my swing, the sharpness of the sword, the angle at which it hits the person, the location in which the person is hit, how much protective clothing the person is wearing, etc. Instead of doing a million calculations for a single action, why not just make it a percentage? 15% chance to do 10 damage. 50% chance to do 6 damaged. Whatever.
