Kayne ult and greedy teammates
I've been a fan of Kayn since release. Ever since he went live he became my most played champion. I hit level 7 on him like 4 days after his release.
During my time playing this champ, I have found out the most frustrating thing in League (at least to me). It's worse than that 0/12/3 Brand support in the last promo match that you really have to win.
By the title, you could have guessed it. People killing the person you are finishing off with Kayn's ult during the delay. Or perhaps you use the ult duration to wait for your cooldowns. But then, there he is. That 3/9 Yasuo that made your game a hell to carry flashes in and finishes your target off with a perfectly aimed and outplaying Q! Wow, that sure was a sick play, BUT. Now you won't get the heal from your ult and you can't dash. Whoops. Suddenly you're in a terrible spot... You die and the fight is lost.
Now, this seems like it's not a big problem but it happens quite often. Too often in my opinion. I've actually lost quite some games just because we lost an important fight like that. And no matter how often I ask my teammates not to do it, they'll always be too greedy and do it anyway. They often even flash to finish them off when they have close to no health with me in them and then I can't dash out and end up stuck between 3 enemies.
My suggestion changing it a little bit so that Kayn won't be punished so hard for his own teammates being jerks. What about still allowing you to dash out when your target dies to someone else? And maybe even give Rhaast the health when this happens?
I also thought about letting us instantly leave the target but that would kind of remove counterplay. The delay is fine in my opinion. It leaves the enemy with a lot of options.
This is not really a "PLS BUFF KAYN!!" post. It's more of a rant to be honest. Feel free to leave your own experiences or opinion!