I feel like Sylas' designer couldn't choose which ability he liked, so he chose them all.
Why does Sylas' abilities have so many ...abilities in them? Like I get how everyone is talking about how his damage is mediocre and stuff (he's still got pretty good ratios/damage tho), but it seems like he has twice as many abilities as your usual champion.
His Q hitting in an x and **slowing of 50%** with a .6AP scaling is already more than good enough for an ability, especially with a 9 second cooldown at rank 1 with 0 cdr? However, he gets a _part 2_, and it creates a circle similar to a / q and does another .6ap damage and **slows for 50%** once again. That's a 120% basic ability with a slow to help you land both parts on a ridiculously low cd.
His W gives him and execute and a gap closer (sure it has low range but it's still there), with a .55AP ratio, increased to **.825AP** if they are low health. This is a great ability in and of itself, but wait, there's more; It also heals him for .35AP, increased to** .70AP** if he is low.
 gets .55AP on her ult, increased to .825AP for low allies. Sure, she can heal all of her teammates at once and Sylas can't, but because Sylas builds way more AP, he heals more than a soraka ult. **on a 14 second CD** (~7 seconds at max rank with 40% cdr).
His E gives him yet another dash as well as a .9AP shield. People have compared his shield to  shield, but riven shield is 100% _bonus_ AD, not total, coupled with the fact that Sylas will have way more AP than riven will have _bonus_ AD. With max cdr/ranks, Sylas will get that shield every 6 seconds, and Riven gets one every 3.6 seconds, so they are basically equal already. But wait there's another **half** to the ability - He gets a pretty decent ranged stun and pulls himself to the target, _and_ knocks them up **(That's a dash, a gapcloser, a shield, a stun, and a knockup all in ONE ability on a 6 SECOND COOLDOWN)**
His ult is ironically the least overloaded part of his kit, other than WHY DOES IT CHANGE AD RATIOS TO AP???. Similar to how  takes reduced damage from ap and how  w only mitigates damage from ad, HE SHOULD HAVE TO KEEP IN MIND THE DRAWBACKS OF TAKING CERTAIN ULTS. If pantheon/ashe gets their ults changed to AP instead of AD because it would be broken as they usually build AD, but when Sylas takes something like  ult he still gets to have it scale with his AP???
Also, his passive is already a really good auto empower (that could honestly be it's own ability), but it's not really a problem compared to the rest of his kit
Compare this dude to someone like twisted fate or something. Riot needs to chill out before the next champ has a global ability that lets you click on them and they die... on a 10 second cooldown