I have seen lots of people commenting on the forums in various areas that dex is useless, but I don't understand why. I'm hoping someone can give me some logic behind that. I did some calculations, and from what I can tell, from a base dps perspective dex is twice as useful as luck.

Let's assume a base damage of 350 (at 100 str) and an attack speed of 1 second (350 dps). These are the norms the calculators use.

If you go 2:2 Str/Dex:

At 100 Dex, your attack speed is 149%. That increases your 1 second damage (dps) to 521.5, and your 5 second damage to 2607.5.

If you go 2:2 Str/Luck:

At 100 luk,, your critical chance is 45.3%. Critical attack strength is 150%, meaning you do damage times 1.5. If you crit, your 1 second damage is 525, and your 5 second damage (if you crit every hit) is 2625.

The luck numbers are higher, but that's only if you crit, which is just under a 50% chance per hit. This means in practicality that you halve those numbers. Now luck is only giving you about half as much damage increase as dex. Assuming you can land 4 out of 5 crits in a row, you're still only doing 2100 damage.

I know this is ignoring gear and skills, so maybe that's the significant factor. But if so, could someone please explain/demonstrate?

*Edited for typos...*