So I was Lulu Vs. Darius in One for All...
And we got crushed.
Ain't that sad? Lulu is Darius' theoretical counter, and we still managed to lose. Fairly handily, too; we were up in kills, but very down in towers, because they could just ignore us and auto the towers. Sure, we could kite them...but our range is so short that if we were in range to attack we were also probably in range to get Q, or apprehended. The fact that he has 20 more natural movespeed then we did didn't help.
I'm not trying to use one for all as a balancing metric or something. It's going to be imbalanced by design, and I know that if we had a more damage-y champion it would have worked out better. But I just think it says something about the current state of Darius' balance when he could go up against his theoretical counter and win fairly easily.