+Crit is it's own affix. Everyone starts with a base 5% chance and a crit damage bonus of 50%. None of the base attributes increase crit anymore (str = barb damage + armor, dex = monk/dh damage + dodge, int = wd/wizard damage + resistances, vitality = health). Your crit stat is independent from these.
You can get + crit chance and + crit damage from items, and a few passives. Only way to increase them. Your monk will not crit any more than anyone else unless his item build has lots of these bonuses.
Other classes have similar "on crit" bonus generation/other effects as well on their skills, by the way.
The reason there are a fair amount of " crits give you spirit" runes is because the skill is AoE. With that it means you could hit more than 1 target and thus your 10% crit will give you a 20% chance to give you spirit and thats only with 2 enemies. There could be 5 and suddenly the rune could be giving you way more spirit.
Its got to be higher than average right?? Say than the barb right? b/c he will have more in strength?
You can get + crit chance and + crit damage from items, and a few passives. Only way to increase them. Your monk will not crit any more than anyone else unless his item build has lots of these bonuses.
Other classes have similar "on crit" bonus generation/other effects as well on their skills, by the way.