The reason why i chose everything in fast attack speed is simple is because everybody try to flle away when they don't have enought life to continue fighting so with that you just run after them and get your kill easy. The second reason is because warwick can heal himself every time he hit somebody so if you hit faster you regain healt faster and you will be able to kill some player like yi easy.

My rune choice is very simple faster you are longer you survive warwick can heal on everyminion or champion so when you do not have enought life to continu fighting just go slain some minon and get a lot of healt in less time

Masterie are a good complement for ths build because with those you get what you didn't get in rune like more dammage, armor penetration, etc..

I choose those item for the only reason that they give a lot of everything and they all give attack speed the first reason and madred bloodrazor are good to have early in the game (the reason why it's after phantom dancer) because when you use your ultimate this item can stack 4% of enemy max healt in dammage witch is really good.

***You really need to follow this order in order to get kill fast and easy without bieng kill

ok here a little way to show you how to jungle effectively and get some lvl fast

1. go to the wraight and use smite on the blue on use hunter call's to kill the rest
2. go to the wolfes use hunter call.. lvl up hungering strike
3. go golem kill those **don't use smite** ...lvl up hungering strike
4. heading to the blue golem here the way to do it strike -> smite -> strike -> hungering strike -> strike -> hunter call-> hungering strike and you should be good

After next time you will do it like that just kill the red lizard to get his buff :)