Well I certainly would defer to PFF as having much more expertise than I, and apparently having the time to watch every game 22 times beginning to end so they can focus on one player at a time.
I will stick by my positive observation of Hayes - he made a lot of important plays. My observation of Ogletree is based on a much smaller sample - but several times I saw him do nothing on running plays to the outside. But maybe that is not the MLB's job.
Saffold...who knows. I can't say I ever once saw him dominate and make a play happen.
The key takeaway is...those videos Brownsugar linked to are awesome if you don't have access to the All-22 and want to really analyze what is going on.