What do you think is your mains worst ability?
It doesn't even have to be a bad ability, it's just you feel as though this ability could be replaced with something that just works better with your champion.
For me
's W Ki-burst, don't get me wrong I like Ki-Burst it's got a stun, it help with Animation canceling, it gives me a passive, it has a low CD, it's just it feels as though this ability was put into her Kit because they needed a W
Get Thinking Ready,Set, GO!
http://49.media.tumblr.com/efe40a2068b03ceb30b7d3aa0a1afa2c/tumblr_new8h7fd4y1r7sijxo1_500.gif
E, just feels like it doesn't have the same impact as some of her other abilities.
's W.
Passive does little damage and has an insane "shoot activation period". By the time I select where I want to shoot, it charges for 1-2 seconds then fires. 1 second sounds so minimal but its enough time for ANYONE to just walk out of range or out of direction I chose
Her passive.
It adds nothing to how Irelia plays and is oftentimes simply useless thanks to league of permaslows, knockups and knockbacks.
W's heal is too weak 
W. I hate how her wall is always perpendicular to her. make it like Viktor's laser, and I would be so happy.
and nothing seemed to fit.
W
Probably could play without if I really wanted it just sucks
W - feels really clunky and it's hitbox is super strange.. I like his whole kit though and I hope for a visual update to make it feel better ^.^
I think for Poppy it would be the w it's a great ability but I think if I had to chose one thing that would be it
her W is actually the most inefficient spell she has. The heal falls off late-game and the mana cost at higher levels costs more than her ultimate. Not to mention the diminishing returns after each bounce hinders it's potential without building some AP. It's also the only ability (Minus her passive) that doesn't have some form of CC, so it's utility isn't that great either.
Hmmm, her passive, but even that I don't really mind because it's saved me and come in handy countless times.
W. Sometimes I don't even level it once until I am forced to...
Powerball - I wish we could change the collision range in some way in regards to Lane Minions and Summoned Pets. Yes, I understand that's the point and skill in regards to handling Powerball as Rammus and his target, but I feel especially punished if I buy an Elixir of Iron or if an ally somehow spreads the enemy minions out and expects me to gank in that mess.
E feels like a filler ability
W: Move Quick
: W, I would keep the wall but make the wall length scale (300/350/450/500) and eat the flow he's built and gain Wall Time scaling from 1 sec to 4 seconds based on is flow.
's flay shouldnt stop him from moving
's E: Their are way better stuns in game.
's R, Behind Enemy Lines
's Q. Way too much counterplay to this and hardly worth the effort of a full charge.
Took me a bit but I'd have to say his passive...
's R.