User blog comment:Qwertyfatcat/A different look on Crit/@comment-10767476-20140210093855

From probability theory we know that for binary random variables (yes/no coin flip), the real value that you will see is almost always "close" to the expected value. That means that if you shoot 100 times with 20% crit, you expect to see 100 * 0.2 = 20 critical hits. You may actually hit 20 +/- 6, but anything else will happen rarely. This may seem surprising to the unitiated, but it is true nonetheless. So crit isn't that unreliable and you can reduce the variance by shooting more often, that is, buy some AS.