Let's talk about stats and weapon ratios
 

People keep saying "AC is broken" can someone ELI5 this? Half of people say that it's the best stat, others say it's worthless after like +50 or some shit.

How much of a difference does ATK make? Does anyone have any good evidence or DPS parsing concerning this?

Weapon ratio rating seem a bit fucked to me. On the wiki, they are ranked by their ratio, implying that 1 dmg = 1 dly. However, Wurmslayer (0.62) is technically as powerful as Swiftwind (0.62). Meanwhile, Swiftblade of Zek (11/18) only has two more damage than Jade Mace (9/18). I feel like I'm taking crazy pills.

Ratio unless you are tanking. Fuck the rest

To an extent. Mainhand speed is key due to flat damage bonus based on level. It applies more often. Offhand is pure ratio.

I've noticed that you see bumps in dmg at different threshold attack levels. For example, if I get my attack above 1250, my dmg output goes through the roof compared with an attack rating slightly lower than 1250.

As for weapon ratio, I haven't done a full study on this yet, but my belief (supported by the evidence I've seen from my parses) is that for two weapons with the same dmg/dly ratios, the lower delay weapon will out damage the higher delay weapon. This is due to the non-linear scaling nature of baseline dmg of each weapon.

So for your example Swiftwind should out damage a wurmslayer because it's got more chances to swing and should output more base damage.

There are a bunch of crazy people who think this works differently, but I haven't seen any evidence contrary to my belief.

I can't speak to +atk but for mainhand speed has a place in the preference calculation due to applying the flat damage bonus of 1 handers based on level more often.

How does this work with things like haste? My first round as a melee so I never worried about this stuff before. Haste seems to be a percentage so shouldn't it in theory improve the ratio of a higher delay weapon more than that of a lower delay weapon?

No.

Let's say you have a 9/18 weapon and a 18/36 weapon. Identical ratio, and if they're in your offhand, identical DPS.
Then you acquire 100% haste. The 9/18 weapon becomes 9/9, and the 18/36 weapon becomes 18/18. Still identical ratio.

Seems like it should, but if you do the math, they come out the same. Which means, rogues are paying way too much for the shitty Green Jade Axe. It's the same ratio as Crystalline Short Sword, but at level 50 it gives you -20hp (-35hp at 60) and quite a bit less push. The PR is really only useful for Trak, and rogues get so much PR anyway, equiping a better ratio off hand will always be preferable.

So, rogues, save yourself several thousand plat and get CSS if you can't afford Seb Dirk or better.