Darius (and some othger juggernauts) need out of teamfight utility

do nothing outside going in and beating people to death in their specific way. More skillful enemy's team -> less chance they get their moment of glory. You see the main reason why other top lane characters will be more useful at higher rank is because they have some ways to be useful without straight attacks. - engage and rally for allies - if we forget his amazing late game damage with gapclosers and durability ult he still can splitpush without troubles and his stun can be useful even if he doesnt get to deal any damage - once again split push. Even if he's in a bad state on paper he's really okay.

So what I am saying. These guys need some kind of help in terms of "utility". For example if you're behind or enemy have better poking teamcomp as Darius you do pretty much nothing. But with some utility option he could become 2nd support by providing some sort of CC or buffs for allies. Honestly I don't even know what is this but think about it.