Adc/Crit items not fair?

So far in a while, crits just don't feel fair. Any adc playing seriously will just go crit as first or second item instantly. Itemization is lack luster because all builds are consistent with the same old thing. Dmg => Crit or Crit=>dmg Mechanics are not that good and I don't understand why guardian angel was changed so much? Adc built item now? The reason I find adc unfair is the amount of lifesteal+crit dmg you output as an adc. At the click of the mouse, you can kill somebody instantly with no skill. current tank rant about them being op. Adcs out heal tanks+out damage tanks and like any champ, tanks do not counter adcs. Ahri killing Draven because he got caught in her charms is not because she's a tank and zones in on him. Cc works on any champ and saying that getting caught is "instant kill" is the same as getting kited. It's literally like saying, you can catch a beetle and a butterfly in a bug net, nobody escapes a cc (Without an item or spell) if they're directly hit. Mages hit hard, but spells have cooldown and usually on cd, adcs can just pick on minions and kill you off sooner than your cd.

I just don't know about adc items... Little customization, strong output.