astrolia

A perfectly valid argument, to be sure. The issue here which deters many players from this, I would think, is the trade-off in damage consistency. When they reworked deadliness, they reworked it into an incredibly, ridiculously under-powered AD boost. Prior to the rework, Deadliness gave 4% critical chance, and so to make up for this in any sort of truly effective way you'd have to replace 4 reds with critical runes, thus losing either 4 ArPen or 4 AD. At that point it's entirely risk-based: how much consistent DPS will you sacrifice for a potential lucky burst.
Your suggestion is a possibly good middle ground, the problem however is the risk of ruining the worth of that 2% chance on a minion. While the thought of a random free burst on an enemy champion is enticing, since the majority of your early game auto-attacks should be spent on last-hitting, the issue you'll encounter is your chances for that burst drop significantly due to the fact that more often than not, you'll be attacking minions instead of champions.

The 4% thing is kinda ???. The point is to give you some crit because something is better than nothing, not "make up" for Deadliness . And obviously you wouldn't want to do this on champions who are just going to farm anyway. On stronger laners, it's definitely something to think about to win your lane.

Finally someone who plays League and seems to have a concept of Mathematics. Great stuff, somehow I only seem to crit on minions though x)

a geek to another geek:
This is not, mathematicly, more effective.
i've calculated, and its better to just go damage. your expected DPS is higher then (not much difference really). 0-2 dmg differende favor AD-runes (varies from champ to champ).

This isn't about dps, it's about laning. You have 0% crit in lane. You don't stand there and dps in lane, you get off 1-2 autoattacks on the enemy carry/support at a time. Having one of those autos crit can make the other AD carry use a potion or the enemy support consume more mana to heal them, which gives you an advantage in lane, especially if they run out of sustain before you and your support. Math supports that having 0.93% gives you an opportunity to crit as you would not have it with 0%, and we apply this math to the game, not to other math.

okei, i'm wrong by considering the DPS,i admit that.

but even if i take away the attack speed it doesnt make much difference. If u want to poke someone early game, it is better with armor pen. or with AD flat to maximize your damage. This gives a higher average attack damage than with 1-2 crit. chance runes (u can calculate the expected dmg per hit). The only difference is if u manage to poke with that 0.93% chance every time it comes, but it is higly unlikely.

I think it's quite obvious that giving up a constant source of damage like an AD or ArPen rune for something non-constant like a crit rune will make you do less constant damage lol.

oh, dont misunderstand me! I am not talking about the constant damage!

i've included the constant damage and the chance for crit. damage. togheter it makes your AVARAGE/EXPECTED damage.

See here
WITHOUT CRIT. RUNES:
Constant damage chance = 100%
Critical strike chance = 0%

so an expected damage would be Y = constant damage * 100%

WITH 1 CRIT. CHANCE RUNE:
constant damage chance = 100%-0.93% = 99,07% (in 99.07% of your hits will be standard)
Criticak strike chance = 0.93% (0.93% of your hits will be crit. strike)

So an expected damage will be =
X = 99,07% * constant damage + 0.93% * crit. damage


all togheter:
If X > Y -> Crit. chance rune raises the expected attack dmg per hit
if Y > X -> Crit. chance rune does not raise the expected attack dmg per hit

of course this is simplified, and I'm not taking all the details, but my math is correct. if the crit chance runes had an higer value, like 1,5 %, they would be better than AD flat runes.

dont take me for a fool, lol

Let's make a full calculation:

Data
Let's say an average attack damage carry has 55 base attack damage at lvl 1.
Each attack damage mark grants 0,95 AD.
Each attack damage quintessence adds 2,25 AD.
We also get 3 flat attack damage from masteries and 0,58 AD/level

Since we are talking about 2 marks difference, we can say:
We have a minimum of 55 + 0,95*7 + 2,25*3 + 0,58 + 3 = 71,98 = 72 attack damage.

Now let us look at the difference between the runepage with crit chance, and the one without.
Full AD
The one with full attack damage marks has the following amount of attack damage at the start:
72 + 0,95*2 = 73,88 = 74 attack damage.

Let's say we have 100% armor penetration, since the starting amount of physical damage blocked by the enemy armor is 10%.

So each attack you will do 74 * 0,9 = 66,5 = 67 damage

+Crit
We have the minimum amount of attack damage, calculated from the first data, which is 72 AD.
The crit chance works like Rubixprime mentioned, I will use the same model.
Crit chance = 0,93*2 = 1,86%
Giving the chance of a normal attack 100-1,86 = 98,14% chance to crit.
Each crit deals 205% damage of a normal attack.
So you have 1,86% chance to deal 72 * 2,05 * 0,9 = 132,84 = 133 damage
And 98,14% chance to deal 72 * 0,9 = 64,8 = 65 damage

65 * 0,9814 + 133 * 0,0186 = 66,26 = 66 damage on an average scale.

Conclusion
67 > 66, Rubixprime is right.

Crit runes are less efficient

Any questions? Feel free to PM me :D

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