Pros

+ Lane Bully
+ High DPS
+ High Sustain
+ High impact ult

Yorick is most commonly known, (or was) as a champion with a very hard to counter lane phase, and for the most part that is very true. His amount of sustain and DPS are very high in the early game, and continue to scale, only falling off in the late, late game. His ult also has the potential to be extremely powerful depending on how good your backline is. Even in the situation where your backline isn't, ulting yourself is still very powerful and lets you output even more damage.

Cons

- Melee with no gap close
- No hard CC
- Weak waveclear
- High mana costs early

Yorick is an extremely outdated character and it shows it in his kit. He lacks hard CC and a gap close, making him a lot weaker in the meta in comparison to other picks, like Gnar and Shen, and other bruisers, like Olaf and Jarvan IV. His only AoE spell is commonly maxed last, and scales off AP, and he doesn't itemize well with items like Ravenous Hydra or Statikk Shiv, giving him fairly weak waveclear. Using a high cost spell to sustain is also fairly costly on his mana pool, especially early on.