Yorick is boring to play?
I really like Yorick's character, and his kit and abilities look really fun in THEORY. He looks like he's a fun and interactive champ to play.
But in practice he just feels so unrewarding to play.
Take a look at his Q, however you use it, it's a lose-lose scenario. If you use it on a minion, you dig a grave, but you're left without any trading tool for several seconds. If you use it to trade with a champion, you don't get graves and can't use your passive, which is part of Yorick's core identity and gameplay.
His Q is similar to Nasus Q, but without any longterm benefits when used on minions, and on a longer cooldown so making a decision is even more punishing.
Also even when you get your ghouls up, the only reliable way to make them attack the enemy champion is by landing a very narrow skillshot.
His ult is on a similar boat. You can use it to splitpush a lane while helping your team, but very often someone will come up and kill it within 15 seconds. You could also use it in teamfights, but then you lost it's splitpushing power.
He seems like he's the kind of champ who's supposed to splitpush a lot, but he lacks the mobility and raw trading power to make him effective at that role.