ad items too good?

i really hate how ad champs (assassin/bruisers) can just build 1 or even none and still kill things in a few blows

attack speed and ap items seem too expensive compared to the ad items also zed and alot of melees have godlike range like bullshit they have a sword shouldn't be sniping with a god damn sword and man when they hit 750 AD... i never see anything close to that on a caster NOT TO MENTION CRIT DOUBLES THE DAMAGE HOLY SHIT... they need to reduce the damage value