More so I was never a fan of all damage types having the same outcome when a crit with a hammer should feel completely different from a crit with a blade. After so time I worked out a system that has a chance as horrible limb losing wounds, but they should only happen on attacks that would actually be capable of it. I've used both and honestly the lasting wound table on every critical gets pretty messy after a while and just doing extra damage can get boring once you're five or so levels into a campaign. In the DMG there is a table to lasting wounds that can leave heroes with crippled or even lost limbs eyes and worst by even a small scratch if it crits. The standard rule for crits in D&D 5E is simply roll double the dice you normally would.
