Fox sports article ranking backup QBs from 32 to 1. They listed graham harrell in the link, but he's not one of the top rated backups--ranked 24 out of 32.
24. Graham Harrell, Green Bay Packers
In all of one game last season, Matt Flynn threw six touchdowns and earned himself a mighty new contract in Seattle. Graham Harrell is not as polished nor as skilled as Flynn. A college superstar at Texas Tech, the Packers seem to like Harrell enough to trust him with the backup duties, but he’s no Matt Flynn. Let’s not assume any Aaron Rodgers’ backup is.
To put that in perspective, Tim Tebow is ranked #10. I'd MUCH rather have Harrell than Tebow at QB, so I'm sure the rankings will be a little controversial.
http://msn.foxsports.com/nfl/story/kyle-orton-graham-harrell-tim-tebow-best-backup-quarterbacks-073112