Ryan Van Bibber from the SB Nation main site ranked the Panthers offensive line the 6th-best in the league. "This is one you probably did not expect to be this high on the list, but it might be the best run blocking group in the league," he says. He also cited Cam's low sack total and the addition of Amini Silatolu at guard to justify his pick.
I personally think that the Panthers have a great O-line. I thought that the instability at right tackle would bring the ranking down into the teens, but I guess Van Bibber either has faith in Otah/Bell or feels that the rest of the line makes up for them.