That doesn't make any sense to me. Do me a huge favor and help this ignorant, unintelligent person. Explain in layman terms, what is the optimal critical chance percentage to have?
It depends on the amount of power u have before considering going into the crit department; lets create a scenario to compare, for example, the rune of the mesmer and the rune of divinity, both with a berserker amulet+jewel, with 0/20/0/25/25, for the thief.
-> since dmg scales linearly with power, lets use a 1:1 ratio, 1 power = 1 dmg, and the hit rate is 1 per second:
-with runes of divinity, u get 1899 power, 47% crit chance, 2.08 crit modifier; aplying the above formula, i get a DPS of 2862.9, my normal hits are 1899 (equal to power) and i get crits of 3949.9 (power*2.08);
-with runes of the mesmer, and using another power rune on 6th slot (we dont need the stun enhancer), we get a DPS of 2887.62, normal hits are 2029 and my crits are now 3855.1 (power*1.9). In this example, 5 runes of mesmer + 1 other vs rune of divinity offered more DPS, but less crit dmg, both by a small margin;
Now, using 20/0/0/25/25, switching precision with power:
-with divinity -> 2099 power, 38% chance, 1.88 crit modifier, DPS 2800.2, crits for 3946.1;
-with mesmer rune -> 2229 power, 37% crit chance, 1.7 crit modifier, DPS 2806.3, crits for 2789.3.
As u can see, despite the fact that power and precision was switched around, still was the rune of mesmer the one with better DPS, and worst crits, so in this case, when comparing the runes alone, lots of more power with some mixed precision made a larger impact on dmg than balanced power/precision and very high crit modifier, however, when comparing the whole of the equipment and stats,
more crit dmg and precision proved to be better than raw power above 2000.
Lets finally split, 10/10/0/25/25:
-divinity -> 1999, 42%, 1.98 modifier => 2821 DPS, 3958 crits;
-mesmer -> 2129, 42%, 1.8 modifier => 2844.3 DPS, 3832.2 crits.
The relation doesnt seems to change, no mather how we twist it, and the best combo for DPS is the one with higher crit chance and crit modifier, for a case where we have around 2K power+2.0 crit modifier+50% crit chance... this seems like a sweet spot. However, with lower than 1.7 power, its better to go for power, since a 100 increase power is over 7% more dmg, and u cant get that much increase with precision + prowess alone. Worthy of note is that the higher ur power is, the less benefit u reap from investing in it, specially noticeable above 2000 power, where each increment of 100 power is less than 5% more dmg, whereas incrementing via traits, getting both prec and prowess will net you more dmg the more you invest, as long as u get +precision and +prowess.
As for the dmg calculations for DPS, to explain better, with 50% crit chance and 2.0 modifier, in a sample of 100 hits, i will get 50 normal hits (P*50), plus 50 critical hits, with each crit being a double dmg hit, thus (P*2*50), so, to make a average, i add first term (P*50), with 2nd term (P*2*50), and then, since it was a sample with 100 hits, ill divide by that. With P = 1 => ((1*50)+(1*2*50))/100 => (50+100)/100 => 1.5.