I feel like Yorick is slightly underpowered, but still strong enough to be fun. Yes he pushes like a champ, but he will not carry a team. His tower pushes are amazing. His ability to zone and burst a single champion is huge. He is still not a carry and fails in team fights.
I actually have been jungling him lately. I used to go jg on him before the rework, but with his new kit I stopped because it didn't seem to match well. After going back to it, he is pretty awesome. His ult gives you the fastest jungle clears, dragons, rifts and barons. If you have ult running, you can go into enemy jungle all day. When his ult is up he can 1 v 2 well. Even in top lane I love seeing someone go in to gank him, the ult comes out and he kills top and jungle :D
While that description may seem strong, here are some negatives that keep him from being OP:
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If his ult is on CD, he is easy to take on and has no escape other than an easy to remove/dodge/leap out of circle. If he ults, just retreat and watch his maiden suicide into tower. As a jungler, it is a victory even if you don't kill someone in a gank if you get them to burn a summoner skill. I see that as the same as getting Yorick to pop his ult. Go in, get his ult out, use whatever to get away, and then as soon as its over go back in and finish him. If you go in with a slow jungler with no escape (some of your tank off-meta junglers) prepare to just get torn a new one the second his ult comes out.
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If his ult is on CD, he is so slow he is easy to gank.
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Once his ult Maiden is in lane, it is dumber than a pile of bricks. When his maiden is out of lane it follows you all day, the second it smells a minion it goes into derp mode. I have had it stand in place and do nothing at one point. Even the enemies were typing "wtf is it doing?" Oh, and nothing like playing ascension, backing to the store, and it gets stuck at teh shop and doesn't warp back to the map. His maiden is buggy AF, period. His ults real strength is in his flying monkeys.
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In a team fight his minions all get wiped fast, and he has very little to add. It does not matter how well you do in game, if your team is doing poorly, he just does not carry. If your team at least holds their own, then he can shine, but he needs help.