There is always going to be second guessing when it comes to the draft. I do know that 31 other teams wished they would have drafted Randy Gregory before the Cowboys did. Some with their 1st rd pick and others with their 2nd rd pick.
I don't know how anyone can really look back and criticize the Cowboys when they come out with Byron Jones, Gregory, Wilson, Russell, and Swaim as good picks and a to-be-determined with Green, Nzeocha, and Gibson. That is just a solid draft. Throw in adding former second round pick RB Michael and I can't think of any reason to look back for regrets.
The Cowboys have had 3 years of solid draft classes. I can't think of a team that has drafted better than the Cowboys these 3 past years.