Nocturne's ultimate really needs to be given more counterplay in team fights.

The lack of counterplay used to be 'acceptable' because Nocturne wasn't particularly strong against aggressive early jungles, but with this season's changes, that weakness is no longer relevant.

If I'm playing a caster or ADC, his ultimate completely removes me from the fight for its entire duration. I can't do anything but retreat, else a bruiser or assassin will run me down, and I won't have vision to disengage/CC it before it's too late.

If I'm anywhere near brush, I'm completely fucked, because attempting to kite out of the brush will make me lose vision, and I can't see someone coming up on me at any brush I'm not standing in. Especially with Ocean rift, this makes contesting objectives impossible.

The overall average win rate doesn't reflect how broken he is yet, because a large number of people are trying him out with the new Sanguine Blade. If you dig in and look at people who mained Nocturne last season, you'll see that they've jumped from 51-53% win rate to 62-65% win rate in the pre-season.

Either tone down the duration or provide a way to counter the vision removal. As it stands, he doesn't even need to do anything; just pressing R is enough to allow his team to win any team fight in any non-turret defense scenario.