I will strongly disagree with you.

for now, I am going to -1 this, but if you fix it up and make it presentable, I may change it.

DPS Kassadin rocks, but there are a few problems I have with this.

1. You aren't an assassin as dps kass, you have no burst; you are built for a sustained fight.
2. Team play. You can't just go around leaving allies to die, and ksing when you can because you are a squishy, and you need your team. You aren't a Carry, and this isn't DotA. Play with your team, coordinate them, it is a team game.
3. Force pulse is not a worthless skill, and you are naive to say so. Leaving a skill like that for naught is like driving your car out and leaving the steering wheel at your house. There is no point in not grabbing something. You are also leaving the bonus levels of Riftwalk until lvls 17-18. that is a waste.
4. You aren't highlighting or utilizing almost any of the plus sides to DPS Kassadin (ex. infinite mana pool, lots of magic/physical damage, etc)
5. Talk about the actual playstyle, telling how to gank, how to harass, etc. For someone wanting to try and do something abnormal, you don't like to do it in an effective way.
6. Lastly, your build could use some work. You are going for heavy AD and, as has been stated above, Kass doesn't benefit from AD. A much better approach is to go for hybrid AS/AP/AD. If you want to know what I mean, I am actually putting up my DPS kassadin build in the next week. You should take a look at it when it is up.

So im getting a down vote because no one makes a a/d kassadin thats pretty shallow. You want that attack speed so you hit quicker with your E.. Armor pen does not work

for a useful dps-ap kassa rocking with nether blade go for malady,end of wit, NASHORS TOOTH!!, rabadons, sorcerer or as boots and rylais crystal sceptre

Also try improving your guide format.Enter colored text, explain every items,give tips, introduce other builds except one.Also do Item Example : Malady

Kassadin should not be played as a DPS for any reason.He lacks of DPS spells and they dont stack up with AD.Plus for runes take Armor penetration runes since you want to do some dmg.And they are better than the AS ones.