You're argument holds no water. If bruisers couldn't 1v1 an adc (when in range of course), especially the immobile ones, and if all they were made to do was win lane, then they would have zero use. No purpose, nada. As it is, darius is trash if you respect his strengths and abuse his weaknesses. He needs a reward for actually sticking to his opponent, which is increasingly difficult with every new reworked champ and new champ added. There is so much mobility and cc and damage that he can barely operate at all, and some games darius is actually just a big oafish minion for the enemy mage or adc.
He's not even a top tier lane bully anymore. Weak split push, very limited in teamfights unless he gets 5 stacks (which is more in the hands of how the enemy plays than how darius plays). Like, damn, you just want to see him sink.
The truth is, even with all the darius buffs in the last two years, he still is 49-50% winrate across most elos (pretty fair tbh) which says a lot about mobility, damage, and cc creep. Like seriously, he's the least of problems for adcs right now. We have jax, irelia, riven, aatrox, kayn, sylas, akali, etc, all jumping on and stomping adcs with VERY LITTLE counterplay. Darius needs flash and ghost to be useful. Well everybody has flash, and ghost can be easily kited with cc, jumping over walls, etc.
Sounds to me like you simply just got stomped recently by a darius and now think he's unfair because he had a good game or two.