I'm really beyond sick and tired of assassins right now

Once they hit their powerspike you just can't do anything. You can't farm under tower, they'll just kill you there. You can't roam, they'll kill you there. You can't let your tower fall, you'll lose your team the game. It's beyond painful dealing with them right now unless you're playing some hyper mobile or super long ranged champion.

's powerspikes- serrated dirk, 1st lethality item, second lethality item, level 6 's powerspike- level 6 's powerspike- level 3, revolver, gunblade, zhonyas

It's just annoying to deal with this. I would take something like zoe over this any day of the weak, at least you have a clear path for outplay against zoe. Against assassins you can't do anything. Sure, you can do some things to help mitigate a little of their burst(walking forward when kat throws a dagger), but they'll still overkill you without it during their powerspikes, mostly due to electrocute.