Nocturne's ultimate should not completely remove champions for the entire duration of team fights
This isn't even hyperbole; if I'm playing something like Vel'koz or Ziggs, I can only throw abilities in the general direction of the fight and often not actually do anything. By the time I've regained vision, the fight is over and we've likely lost, because I couldn't participate. Alternatively, an assassin will flank and one shot me because I don't have vision to keep it away or stop it until it's too late.
This makes it completely impossible to win or carry games as these champions. Nocturne himself and the dash aren't even relevant.
This ability needs to be updated to reflect the high damage and short team fight durations we have now.