We have certainly had pitchers who pitched like aces in their time with the Braves with Javier Vazquez coming to mind. Kris Medlen had fantastic stretches as well and Julio has been borderline the last two seasons.
With that said, it's hard not to be pleased with Wood and Shelby. Both have looked quite fantastic this year, and I am cautiously optimistic about Julio. Despite the terrible numbers thus far, he has had a number of stretches the past two months where he's looked fantastic.
We have a solid core of pitching that is already performing. The next step is developing a couple of more guys so that we don't have to spend big in FA on another pitcher.