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Completely no ultility in teamfights? Getting outscaled by everyone else? Useless late game? Falls off if not fed? Enough reasons. I'm not talking about "easy to kite/easy to gank" stuff. It's more about procs and cons. Darius is good only against noobs. And that's the trouble.
He has a hook and a slow. Peel for the ADC and kill the pesky assassin that's trying to kill them. Sure, he's not the best team fighter, but he's not completely awful either.
Him getting outscaled isn't a problem though, is it? He's an early to mid game champion. What's wrong with that?
There are plenty of people who main Darius and do fine in plat+ though. If you have 15-50 games under your belt his win rate averages over 50%, so he's basically okay. The best pick? No, not really. A horrible pick? Nah. He's no Olaf.
I mean, he might benefit from a buff (and I certainly wouldn't refuse one), but an actual rework? I don't see why.