Please be aware of what using your ult at a bad time does for your team.
heres a scenario:
Nocturne and Morde are on the same team.
Kaisa and Udyr are on the same team.
Nocturne ults Kaisa, Udyr and Mordekaiser are within arms reach.
Nocturne is on Kaisa, latched with E.....
Mordekaiser ults Kaisa, and duels Kaisa for 7seconds, while Nocturne already had the kill secured.
Mordekaiser just wasted Nocturnes R and E, and left Nocturne alone to duel Udyr(With his entire kit on CD).
Good job Mordekaiser.