Orlando Pace and Chris Williams were both ranked among the league's 10 worst offensive tackles in 2009, according to the website Pro Football Focus.
Although it's difficult to come up with a way to grade offensive linemen, PFF developed a formula that included sacks, hits and pressures an offensive lineman gave up. The lower the number, the better the linemen.
That Jake Long, the top pick in 2008 of the Miami Dolphins, is the top-rated left tackle isn't a surprise. Long is already a two-time Pro Bowl selection.
But the league's top-rated right tackle? Anthony Collins of the Cincinnati Bengals, a fourth-round pick in 2008 who started seven games in 2009 before being replaced in the lineup. Interestingly, his replacement, Dennis Roland, was ranked third by PFF, behind Pittsburgh's Willie Colon.
Pace was the fifth-worst left tackle while Williams was the eighth-worst right tackle, according to PFF.
PFF wrote that while Pace only gave up one sack, he gave up a pressure once every 10 pass plays.
In the NFC North, the only top-10 left tackle was Bryant McKinnie of the Minnesota Vikings, who was ranked 10th.
Vikings rookie Phil Loadholt was the seventh-rated right tackle.
Green Bay's Allen Barbre was the league's worst-rated right tackle.
Here is the link to PFF's full report.