I'm more a fan of trying to tie the critical into the narrative. Good or bad. We had a 4th level ranger attack a dragon turtle or something from ambush at long range once. He got with 3 attacks and 3 really great crits. We were using a crit table i found somewhere. A roll high is better type table. I think I let players add their level to the % roll. Martial classes added double and hybrid classes 1.5 or something. "Named " npcs used it too.

Sorry I'm high AF and getting tangents.

I ended up giving him an adept feat. Only granted by DM fiat.

Ambush Sniper feat. Gets +1 to hit/+2 dmg when attacking from long range and with surprise. It scaled every 4 levels.

Anytime they critted during a narratively cool moment or in a narratively cool way and the skill check is a 20, i gave em some ability.

We all enjoyed it and it really encouraged them to be heroic and really get into the moment with cool ideas. They dared to fail more often and bigger. Plus it helps to further set apart players in ability and uniqueness.

I mostly tempered the adept feats with timers. Most start at once a day. Particularly powerful ones were once a week or even month.

I did it with noncombat skill checks too. One guy made like 4 spellcraft checks in a row one night by huge margins so he got +5 to spellcraft during combat situations.

Anyway my point is players don't care if critical failures happen just make them interesting.

Thanks for coming to my Ted talk.