I agree. How could anyone ever be good as Zed?

Indeed.

My match history is all Zed games too, and the only time I outright lost my lane was to Elise; I was super tired and failed to counter-build her, as well as failed to buy health potions to sustain (two very big oversights). Skill-wise (rather than strategy-wise), I lost the lane due to level 1 gank from enemy jungler and no presence from my own jungler (despite Elise being superpushed up against my tower non-stop.) This was due to the other lanes failing even harder than I was (jungler couldn't afford to come help me). I still managed to turn around my score and threaten the *very* fed enemy carry, unfortunately noone else on the team had any presence due to being shut down.

Lol, get a history like that with ranked games, then it might actually mean something.

You can get a history like that with pretty much any damage-dealing champion.

Hell, if you're good enough you could get that with ADC sona.

True story, get to 300 AD swap to building Health. BC, IE, WM, AI, FM, NT. Just a general build, I usually start off building a wriggles straight to BC and Ninja Tabi, sell the wriggles when it's no longer necessary.

his ult is pretty weak it should do some base damage maybe a slow so you can get some hits on a champ

It has a flash attached to it.
It has base damage attached to it.
It increases the theoretical AD ratio of all your abilities by a large amount.

Zed was pretty good the first time I tried him. I just play him as an assassin. He seems to have a whole lot more damage than Kha'Zix and can burst the carry down really fast. Though, he's the only assassin I am good with right now, so I can't really say much. But for now, I work with him well and can do an assassin job well using him.
My core items for him right now is Berserker's Greaves and Black Cleaver then Bloodthirster. That usually helps him out pretty damn well. So far, on average, Zed has around a 50% win rate (which means he's around average, not up or down).