It's just like playing XCOM. Basic math says there's a 95% chance of something bad not happening? You'd better believe it's happening every single session!

I prefer Fate's system:

When you don't like your roll, you can either reroll or take a flat bonus. Because Fate is a dice pool instead of flat-probability-1d20, if you do take the reroll to make up for an atrocious roll, you're less likely to get another atrocious roll. Usually you just need the little bump to make a difference.

I bet it comes up approximately 1/20 times it'd used.

Statistically it comes up 5% of the time you use a hero point, so yeah, about as often as rolling a nat 20.

I was thinking of that as a house rule for Mutants and Masterminds (which has a similar system, but is much more generous with the reroll). I think it's better if you don't feel like you wasted the Hero Point because you rolled low.

That said, it works best if it's a success/fail type thing. I understand pathfinder has a lot of things with critical success and critical failure. I guess you get it back if you don't score better?

D&D 5e has a similar system.

The new 5e rules have the same called inspiration. Inspiration points are given out at the DMs discretion. It's a nice reward to give out for stuff like good roleplay and what not. I'm guessing it's the same for hero points.

Fair dice was broken, at least a launch. If you had a really high armor class the NPCs would get an absurd number of nat 20s if that was the only way they could hit you.

Considerably more given you'll generally use it on a bad roll.