Only time will tell, but the early impression he is leaving on the Seahawks coaching staff and fellow players is noticeable. He has something that the Seahawks have not had in a receiver in a long time, speed. He was clocked at 4.38 in the forty yard dash during the combine, and will keep defenses honest. The Seahawks' offensive coordinator Greg Knapp was known to go deep often, while with the Falcons and Raiders, so Butler's rookie role may be a bit underestimated.
He is a small receiver at only 5'10, but is built like another receiver who made a huge impact as a rookie last year and that's DeSean Jackson. Jackson had sixty two catches, 912 yards, and two touchdowns as a rookie for the Eagles last season. Now, i am not saying that Deon Butler will be as successful, but he possesses many of the same qualities.
He also has very good hands. There is definitely a reason he was able to break former Seahawk Bobby Engram's Penn State receiving record. He also shows the ability to make unbelievable catches. However he still lacks consistency in that area, though that is not anything unusual for a rookie receiver.
It will be interesteing to see how big of an impact he will have for the Seahawks' offense this season, but if the early buzz from fellow players is any indication, we may be in for a real surprise.