Yorick is more of a late game champion.People are complaining because 1)there isnt any reliable build found yet 2)they just like their new champ to faceroll from lvl 1 with little effort . From the builds i tested, 1 works great from lvl 12 and on,and the other gives him a better start but less effectivness later.
Late Game Power:
These are the core,with trinity or BV at the end.Give everything yorick needs,and u are rly usefull in fights.
Better Early Game:
aegis of the legion
(thinking bout nasus? :P )
Aegis of the legion works rly great on him.Other items are self explanatory.Its a pretty cheap core build but gives him all he needs and boost him rly good.If u are concered about mana,with some runes and utility tree,there isnt much to worry about,trust me.
For masteries,i thought def tree would boost ghouls hp early,but its negligible.Better go 9/0/21 for lower cds,mana regen and magic pen for your skills.Runes,i go with mana regen seals,armor pen marks,flat hp Quints and flat mana blue.Give him all around utility early.
But rly,he is a hard champ to master.If you like that challenge and get a nice payoff for playing good,this is your champ,and hes worth buying.