I was more of a fan of the main manga and Jack than the original oneshot but if you are interested in Tokyo Ghoul then it's good to check it out to see where it all came from.
My rating of 5 is only because of the last oneshot. Some I liked and others I just thought were okay but the last one was really good. I guess for me it hit home so I liked it a lot.
Tokyo Ghoul (Oneshot)