No, I have nothing against the undrafted prospects. The Cowboys just need more out of their draft picks.
The Dallas Cowboys have a reputation for mining some pretty good talent from the undrafted free agents they bring into training camp every year. As OCC pointed out in a post at the end of the draft, nine UDFAs started at least one game for the team in 2015, and there were also key role players like Lance Dunbar, David Irving, and all three of the specialists who came into the league as UDFAs.