Over at Football Outsiders, they do a "Draft Report Card Report" every year, where they gather the grades given to each team's draft and give a consensus ranking. The Cowboys placed poorly this year, at 28th. You can find it here.
The cool thing is that they revisit it 5 years later to see how it worked out. And here's what they've found:
"It's fair to ask: does any of this really mean anything? And the answer is "probably not." After recapping the 2017 draft a few weeks ago,
we broke out the Draft Report Card Report from that year
and compared select evaluator's grades to the actual Approximate Value
produced by each team's draft class. The good news is that every evaluator finished with a positive correlation—nobody was so wrong that you could make money betting against them. The bad news is that the strongest correlation was just 0.088, which is effectively random noise."
Nobody knows anything.