We have to learn, especially in this day and age, to stop being so reactionary and let things develop ie be patient. Most rookies don't suddenly just pop off right off the bat. They need time to develop and earn their role, especially at the skill positions that are more difficult to grasp.
JSN was the top WR prospect coming out of college and the first WR picked in the draft. He's a special talent. Have we forgotten that the kid broke his wrist in August? From what I see, the Seahawks haven't been running much 3WR sets either, so far. So, in effect, he really hasn't even gotten the chance to prove himself yet. It'll come...and if either DK or Lockett were to miss time, with his talent, he could be a huge boon to your starting lineup.