@Philitt well zed is captain glass cannon to begin with, he's literally got to go balls deep like champs such as xin, kha, etc. also it's not the sustain you want from bloodthirster, 100 ad to 80 ad is a major difference in ad with zed's w passive, also you don't stack crits on zed he's a burst mage, same reason why you don't see a kha with an ie (or you shouldn't -.-) the crits don't do anything, you burst your spells hit maybe, i repeat, MAYBE 2-3 auto atks if lucky then boom you run like hell cause odds are they'll be on your ass, so the crit is really a waste in terms of gold and damage comparison, hope that clears things up.

It might sound stupid but why not a IE over a Bloodthirster you lack sustain but have way more damage. Can someone tell me?

Maxing W second makes you significantly weaker at a time when objectives like Baron and towers are being contested. Having a maxed Q at lvl 13 will help you win those mid-game pokes at tower and kill the carries faster in teamfights. Reducing W to 16 seconds doesn't make you a lot mobile; it's still as bad as Tristana's jump CD. Also, a maxed W at lvl 13 is 25% bonus AD (only about 35 if your bonus AD consists of Brutalizer + stacked BT + 15 from runes. Round all his damage ratios to 100% and that's at most +105 damage for his burst combo). A maxed Q at level 13 is an increase of 140 damage from rank 1 and provides for a stronger poke.

Great guide helped me when I started using him. I recommend though to all that you max W second, the % AD it gives keeps the damage up and the cooldown on the skill allows you to become a lot more mobile.

Decent guide bro but one thing with your ult combo. I think it'd be better to follow ult up with living shadow, this way you get tripple shuriken and slash + the delayed proc dmg from ult will go up drastically.

Excellent guide, I personally run AD per lvl reds and quints for mine though. It lets him snowball so much harder especially because he isn't going to be doing much instant kills at lvl 1-4 anyhow.

http://www.solomid.net/guides.php?g=39635-accentsace-zed-build-guide
This is best guide for zed for top lane...just i think for runes buy 3 seal for energy regen 0.63/per5sec

Errm...I'm on EUW and Zeds W goes on CD before you jump to it or it runs out.

Hmm Thanks for giving a good summary of Zed helped me understand him more :D