Don't forget Tommy Harris in Chicago. He have a very good rookie season as well. You mention rookie's that are Pro Bowl caliber straight from college. A lot of that has to do with obviously talent, and more importantly, opportunity. Dunta is a great player but was given more opportunity that most rookies get. Early in the season he didn't look good at all.
I think when it's all said and done, there a several taken in last years draft that will visit many Pro Bowls in their careers. There are also going to be the busts, like with every draft. It's not fair to judge them on their rookie seasons.