Yorick, Why Not to Buy Him

I recently spent 6300 influence points to obtain Yorick, the Grave Digger, since he sounded like a pretty cool champion. It took me roughly two weeks to save up that amount of IP, and when I bought him, I was disappointed as soon as I got into the game. His minions did not do nearly enough damage to be effective, and since they lost 20% of there hp every second after summoning, they could easily be killed early game by normal lane minions. As of current, his ultimate is useless and underpowered, and I find that if a player dies while the revenant is up, they aren’t alive long enough to do anything. In my opinion, do not buy him until he is buffed.