Why I Hate Sylas: He is a physical (or digital) embodiment of laziness.
Sylas has received quite a bit of hate since his reveal a few days ago. While this hate is certainly valid and warranted, I'd like to point out my personal reason for hating this champion. Simply put, Sylas shows just how lazy Riot has gotten.
Let's begin with his design. He is a human, and while there is nothing wrong with this (my favorite champions are Darius and Graves, both of which are humans), adding another human to the champion lineup is just redundant. Not to mention that humans in a fantasy video game are pretty lame innately boring because we are all humans; there's nothing really cool about seeing a human in a video game. Also, his prisoner design is very basic. It's like the design team thought "well he's a prisoner, what do prisoners have?" "Oh, I know! chains!" Yea really well thought out there champion design team, it definitely doesn't look like you're scraping the bottom of the barrel for champion ideas.
Next, let's talk about his actual gameplay design, and why it shows how lazy Riot is. His passive is essentially Nocturne's passive but without the heal. His Q is essentially Poppy's Q but with a more specific skillshot point with Jarvan Q range. His W is essentially Talon's Q, but it provides a heal and an execute (why both?). His E is essentially Riven E and Camille E combined (which is a big middle finger to those two champs). Lastly, his R is literally just other Champions' R's. There is literally nothing unique about this champion. Sylas does not bring any new gameplay mechanics to League, so there is literally no reason for his existence. The fact that he can hijack enemy champions' ultimates does not make him cool or interesting in any way, it just further emphasizes how much of a nothing champion he is and shows how Riot is either creatively bankrupt or lazy. Champions have the abilities they have for a reason. Most good champion kits allow for interaction between all of their abilities (Ex. Darius - all of Darius' damaging abilities apply a stack of his passive and his ultimate damage scales off of how many passive stacks he has on an enemy champion. All of his abilities work in tandem with each other, they aren't just there). Sylas just has a hodgepodge of abilities that don't make much sense together because they have just been copied and pasted from other champions.
Additionally, this champion will be impossible to balance, and you can find other discussions on this topic so I won't really go into it. My two cents on his balance is that the numbers on his basic abilities have to be over tuned because if he can't get a good ultimate he will be a 4 ability champion, instead of 5. Balancing his ultimate is also impossible because all the balance team can do is make the damage ratio insane due to his inability to make his ultimate interact with the rest of his kit like well-designed champions can (Look to Darius here again. Sylas can't stack Darius passive, so in order for a Sylas Darius ult to be at all effective, Sylas' ult damage ratio has to be insane.)
I simply don't see a legitimate reason for Sylas' existence. He brings nothing new to the game and was clearly rushed out the door by some higher up, or at least that's what it appears to be. Neeko was released on December 7 2018, and Sylas will be released near the end of January 2019. That's about a month and a half between new champions releases. It would be much more beneficial for the game if Riot focused on tuning the champions and gameplay mechanics they have already released, rather than introducing new champions and mechanics before they've even had time to address the issues already at hand.