Agree with lickz. Guide was good in season 2 but your season 3 record indicates that there are some changes that make your build/strategy obsolete.

What i've found success with in terms of item build with Kata is the following build:

Boots, 3 pots
First back either revolver or Kages depending on if im ahead or not + negatron cloak.
second back: needlessly large + sorc shoes
third back: finish DC

after that i work towards finishing gunblade, zhonyas, abysal and usually a GA as my final item.
i find that it works well for me.
I'm finding maxing W first is also, well not really better but I like it more.

MrPancake, I think you are right in the sense that, since hat was nerfed, it isn't worth it to get it first in most cases.But you shouldn't get abyssal/haunting guise, but dfg instead.DFG offers enough ap and an active that allows you to 1v1 in the mid game.You can have 286 ap with the 2 combined.Also, abyssal isn't good enough for kat early on, you can get a negatron early, but not abyssal.Too low damage, too high cost.Also, haunting guise isn't worth it for her, you don't need the health and you can get a blasting wand and still do more damage.

Great guide overall, but I don't think maxing W is good at all.Think about it:Q provides safer farming,harrassing and bigger burst than W. Using W to harrass will put you in a really bad position, in which people will retaliate or the jungler will gank.You can't use W to last hit caster minions without being poked.And, if you go in and quickly get out, q will do bigger burst.If you go in and stay, you die.Also, you should put zhonyas in your build, if you aren't having issue with magic damage, it is better to get a zhonyas than an abyssal, because, even though they won't have mr reduced, you can be invunerable until somebody dies and you can chain abilities.

Guide was good s2. Need some work this season, I suggest mastering the champion before posting the rest of this guide as your katarina has been sub par this season, to say the least

sooo quick question, is hybrid kat viable? sinister steal and ult are her main sources of damage. maybe its a typo but she has higher ad ratios. thoughts?

I don't think going into a raba cap right after your boots is the best option. Maybe abyssal scepter or haunting guise then the cap because you should at least have some AP so the cap's passive will actually be useful.

Thank you, I agree that Cho'Gath is difficult but he shouldn't be killing you, even in my video guide that I posted you can see that I beat Diana in lane.

Thanks for the feedback though :D

Well anything that can disrupt katarina's ult easily in lane '' counters here '' since she wont be able to burst down such characters.

i.e. chogath ( knockup low cooldown, much hp tankyness )

diana ( low cooldown disrupt on e, gets shield which will absorb kats burst pretty much )

kassadin ( just silences you and ports away )

still i agree on your opinion that a good kat shouldnt look at her lane only, but clean up whenever the chance appears :)

Good general guide, keep up the good work ;).

Her early game is extremely weak, which is why the AP Quints are good, you can also got for Movement Speed, it's personal preference.

I really wouldn't max Q, W is just better in my opinion because the damage is too big and it's an amazing wave clearer.

I FP Kat when I feel like it haha, a good Katarina will be able to do work regarldess of the comp. Comps with good CC like Sona or Amumu or good for Kat because they give Katarina the chance to ult without being interrupted. Diana is pretty difficult for Katarina but still easily winnable. There aren't really any "counters". You gank lanes that have the opportunities open, you clean up :)