I could make an excuse about how this wasn't me, but it's remarkably irrelevant. But now that it's on here, I might as well make it.
Come back later.

EDIT: I took a keyboard to it, and put what I believe on here.

As for the above post, your post was totally... Ah, justified, if your grammar was that of a child's.

I modified this to be a hybrid build, to address the points that are still relevant.

The only thing I have issue with is W. I don't like Killer Instinct. That tiny survivability is not worth the couple of seconds shaved off of an ability to me. It allows for full damage on each bounce - it also takes a bounce away.

Unfortunately, there is a problem with a pure AD Kat - it wastes Shunpo entirely, aside from the mobility aspect, and she doesn't have a lot of nukes to begin with. Also with no physical attack steroid, or anything like that, it's a disappointing right click kill.

... I really Hope you are trolling with this guide you have here. I was looking for an AD build to try out and this was "new" so I poked my Head in. as it turns out: this is a terrible joke. I can find holes in all of your arguments and just destroy them with sound logic. So let's get started then:

First of: your "Insight" is most likely based on a Handful of games. You most likely rushed into Team fights head first, if not engaged the fight your self. Kat gets focused because she is a threat if played right.

You advice on Runes isn't based on anything really. you mention running Armor Seals becasue of early skirmishes but you don't explain your Glyphs, Marks, or Quiints. Your advice on Masteries is sorely misguided. "The first 9 offensive masteries are useless" WHAT!?! Archaic Knowledge works so well with Kat it isn't even funny. and specking all the way down to Havoc is worth two mastery points on Kat since she scales both AD and AP.

You need Kat's W early on. even if it is just one point until level 14 it helps Kat out so freaking much. Preparation allow Kat's Q to hit at full damage for each hit instead of it diminishing, and gives you extra survivability when you use Shunpo.

"Kat doesn't get around the map very well" this is just... I don't even know where to begin. she can Jump to wards, through walls, and onto minions. she is so good at Ganking the adjacent lane it's not even funny.

You seem to have this misguided conception that AP Kat and Gunblade Kat are two different things. THEY AREN'T. Kat is reliant on Hextech Revolver for the Spell Vamp and therefore sustainability. the fact of the matter is Hextech Gunblade is better for Kat than Will of the Ancients

Your build and your talk claim to be AD. well then WTF is Rabadon's Deathcap doing in your build?

I have a lot more to say about this build but the sad truth is this build probably took as long for you to put together as it did for me to read through this and type. You better be fixing this.