Here is what Sickels has to say about the Arizona prospects:

13) Arizona Diamondbacks (9): Strengths: good group of pitching prospects, with Tyler Skaggs, Archie Bradley, Andrew Chafin, David Holmberg a sound group with several of C+/B- beyond them. Weaknesses: Impact hitting, though Adam Eaton and Matt Davidson can be regulars and Stryker Trahan must be watched closely. Overall a solid system.

I would recommend that, for context, you read the full rankings, covering all 30 teams, with strengths and weaknesses for each franchise. I'm sure John B will be along with a slightly more informed opinion, but that ranking sounds about accurate. Obviously, the departure of Trevor Bauer has had some impact - though, I note, it doesn't exactly appear to have helped the Cleveland Indians very much, as they are ranked all the way down at #24. But, if our pitching is somewhat depleted, the system is certainly a lot stronger up the middle than it was a year ago.