Read my guide.. i strongly disagree with all of this.. wtf with the warmogs?? makes no sense, rylais is for health, replace the warmogs with a mejais.. just check my build .. sorc boots are useless if you get a void staff.. w.e take it e.z
- HeAt

its good with ability power the problem is that u became completely worthless as soon as u used shumpo / ulti ... its viable but its a really last hit character then and nothing else... u jst have to run all the time

DId you try it? with Abi Power? Just try it, cuz when i tried that wasn't bad. I wanna see if someone else think that Abi Power Katarina is as good as Dmg Katarina.

Zargouf is right. Katarina is a early game dps (even nuker) but what he didn't tell is that katarina is way mor effective when soloing. When you get lvl 6-7 ask to be replace at mid and start to gank on line. This way you'll be able to get fed.(if you have skill at least :P)

TBH i dont think that making her on ability power is a good idea.
Her ultimate is magic +50% of your melee or 30% of your ap witch makes it as magic as melee.
I've tried her yesterday, and she is ok, with 1 exception. Her Health pool, and some ulti mechanics.

With so low HP she gets raped by 2x timebomb from Zilian. 450HP base is just pure LOL for a melee char without stealth.

But you are totaly undependant on mana or health with your skills witch makes her quite unique. Plenty chars NEED mana so their hp pool is higher, plenty chars need health for their skills that is why their hp pool is bigger.
Other topic is that her ultimate is channeled WAY too long. With your squishiness you are getting raped in 1-2 sec by nearly any dps char.

Still making this char on AP is... realy bad idea.
I found that making her a carry killer char is good idea. Just max out Shunpo and Killer instincts for dodge, and you should be able to KI->blink->Melee->Ulti->blink and kill any carry coz of 70% dodge.