I'll be quite honest with everyone and myself: Yorick is a good champion if you're a good player. Everyone says he sucks and needs an insane buff, but i play him just fine, and i've carried quite a few games with him.
My suggestion is to build him as an AD carry and you'll be fine. Why, i even wreck people with him with only a manamune, merc treads, and sheen.
All in all, just face it: learn to play a difficult champion. Hell, he's not even difficult! Just auto attack and spam his ghouls! He's great for pushing and team fights.