Fans of the Seattle Seahawks aren’t used to reading negative comments about their team’s on-the-field product this off-season, but at least one analyst believes that Russell Wilson, Marshawn Lynch and the rest of the Hawks’ offense will be operating behind one of the NFL’s worst lines in 2014.

On Monday, Mike Tanier of Sports on Earth revealed his 2014 O-line rankings, where he placed the Seahawks’ line at No. 30 in the league while calling the unit the team’s “Achilles’ heel.”

Here’s part of what Tanier wrote:

Explain how a team with Marshawn Lynch and an option threat at quarterback finished dead last in the league in converting power situations: The Seahawks got the job done on just 49 percent of short-yardage and goal-to-go conversions. Explain how Russell Wilson got sacked 44 times, despite the fact that the Seahawks rarely faced the kind of pressure-passing situations that lead to easy sacks. Finally, take a look at the three-fifths of their line that are not named Max Unger or Russell Okung, and note that two regulars from last season are gone.

It would be easy to dismiss Tanier’s ranking as an empty off-season diversion, but he’s got a point. The Hawks’ line didn’t exactly pass the eyeball test in 2013 and will undergo some major changes in Seattle’s effort to repeat as Super Bowl champs.

After losing starters Breno Giacomini (New York Jets) and Paul McQuistan (Cleveland Browns) via free-agency, and with incumbent starters in center Max Unger, right guard J.R. Sweezy and left tackle Russell Okung — who is coming off of off-season foot surgery — there seem to be two open starting positions for 2014: Left guard and right tackle.

Some might see the exits of the oft-maligned Giacomini and McQuistan as addition by subtraction, but starting experience in the NFL is a hard-earned commodity.

Replenishing the line’s depth was a priority in May’s NFL draft. The Hawks thought they’d done just that by adding second-round pick Justin Britt and sixth-rounder Garrett Scott, but that was before Scott was knocked out of action for at least a year after the team discovered he had a rare heart condition following his selection. He will spend the 2014 season on injured reserve and may never play in the NFL.

Former first-round pick James Carpenter will get the first attempt at nailing down the guard position that had been McQuistan’s for parts of the last three seasons. Carpenter has been impressive this off-season, appearing lighter, more mobile and explosive than ever while drawing praise from offensive line coach Tom Cable and head coach Pete Carroll for his efforts.