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out of the rounds in this photo, which is the one that is borderline bad or are all of them bad?
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I didn't fire them so it makes it very difficult to answer that. The first two on the left, show primers that appear to still be rounded normally or almost so. The middle round and the right hand two definitely show indications of primer cratering and ejector marks.
The best resource I have found listing the most comprehensive list can be found
here.
Learning what you are shooting and noticing changes from the list are what I find to be most useful. On bolt action rifles and revolvers I almost always notice changes in extraction when I begin to see evidence of high pressure. But I am very careful in sizing so I don't tend to get flat primers from excessive headspace.