Ok, first of all, you're a onetrick singed. Just saying, you're one type of universal cancer calling something else cancer.
Darius's weakness is meant to be extremely kitable. Even in his current state, as a singed player, you should have no trouble kiting him.
That weakness makes Darius easy to counterplay against but feel like absolute crap to play as (same is true for most juggernauts)
Current state people just jampack mobility so Darius is even slightly relevant. Try Darius without ghost and phase rush, and he'll be pure crap. Not grabbing TP makes him susceptible to other lanes snowballing (accentuated by enemy laner using tp to help their team), and making succesful ganks on Dar extremely punishing.
It's not fun to play against Darius, but it's way worse, for most people, to play against singed. Could also say the same about most other champs, albeit for different reasons.
For Dar, just google up how to counter him. Being a juggernaut means being binary, which means easy counterplay.