Recent Bleacher Report Article of Corners currently playing in the NFL lists 4 Packers Corners on the list. Giving Ratings in all aspects of being a corner. Agility, Ball Skills, Awareness, Tackling, Coverage, Burn Factor etc.
#71 - Sam Shields
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/31
#66 - Jarrett Bush
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/36
#20 - Tramon Williams
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/82
#2 - Charles Woodson
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/100
It's Bleacher Report so take from it what you want
#71 - Sam Shields
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/31
#66 - Jarrett Bush
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/36
#20 - Tramon Williams
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/82
#2 - Charles Woodson
http://bleacherreport.com/articles/1118304-br-nfl-1000-top-100-cornerbacks/page/100
It's Bleacher Report so take from it what you want