Depends on your system. I've not actually played a TTRPG where that's how crits worked. I believe that's how it works in PF2E, though, which I really wanna try. Just can't manage to convince the nerds I play with.
PF2E's pretty fun. The Remaster makes things a pain to look things up, but that's more on WotC and should be largely fixed in a year when Archives of Nethys finally gets caught up
Pathfinder. For people that play D&D and think “I wish this had more complicated rules…”
But yes, that’s how crits work in Pathfinder - if you beat the target number by 10, that’s a crit success. Conversely, if you miss the target number by 10, that’s a crit fail.
For people that play D&D and think “I wish this had more complicated rules…”
2e generally has rules that are on par with 5e, or even simpler in many cases, just written in a way that makes them sound like a software development reference text. The number of times I've been "Ohhhh, they mean X! Why didn't they just say so?!?!?"
Add item, status, circumstance (e.g. flatfooted which adjust your AC by -2 or cover which increases it) bonuses and you get the actual result of a check.