The good: Bob Quinn made a concerted effort in his first draft as Lions GM to bolster the offensive line, selecting three offensive linemen is his first five picks, including tackle Taylor Decker No. 16 overall.

Decker ended up playing every snap for the Lions at left tackle, and was voted to the Pro Football Writers Association's All-Rookie Team. Pro Football Focus graded him among the top 12 left tackles in the NFL this season.

Graham Glasgow turned into a jack-of-all-trades for the Lions after they selected him in the third round. He started 11 total games at both guard and center.

Joe Dahl, the team's fifth round pick, saw some limited action at guard as a rookie, but the Lions have said they like how he's progressing.

Just from a raw numbers standpoint, Detroit's line was an improved pass-blocking unit this year over last year. They allowed 37 sacks, which were 11th best in the league, which bettered the 44 they allowed in 2015.

Detroit ranked in the top half of the league (13th) in allowing 79 quarterback hits on the year. That number was down considerably from the 103 they allowed in 2015.

The bad: The Lions struggled to run the football with any real consistency all season. Detroit finished 30th running the football at 81.9 yards per game.

Losing starting running back Ameer Abdullah after just two games certainly didn't help those numbers, but injuries happen in the NFL, and teams still have to find a way to be productive with the weapons they do have. The Lions never did when it came to their run game.

The left guard spot was an area of weakness all year. Laken Tomlinson and Glasgow split time there. The two combined for six sacks allowed, 10 penalties and 49 total pressures. Glasgow looked much better playing center.

Key stat: Detroit was ranked 14th in STATS INC's annual protection index ratings, which grades each team's ability to protect its quarterback. It focuses on passing plays, and takes sacks, QB pressures, knockdowns and penalties by offensive linemen into consideration. Detroit graded 58.8 out of 100. New Orleans was tops in the NFL at 80.1.

Free agents: The Lions have some big decisions to make, especially along the right side of the line. Right guard Larry Warford and right tackle Riley Reiff are both unrestricted free agents, and both are expected to garner some interest in free agency, if they get there.

Pro Football Focus graded Warford as the best run blocker and pass protector on Detroit's line this season. He indicated after the season that he'd explore free agency.

Reiff moved from left tackle to right tackle pretty seamlessly. The fact that he can play both could be appealing to some teams. If a team looks at Reiff as a left tackle, and offers him left tackle money, will the Lions still be players for his services?

Garrett Reynolds, who was signed late in the year, is also an unrestricted free agent.

Draft: This is a decent class of offensive linemen, but not as talented at the top as some we've seen in recent drafts.

Ryan Ramczyk (Wisconsin), Cam Robinson (Alabama) and Garrett Bolles (Utah) are the consensus top tackles available.

Forest Lamp (Western Kentucky), Dan Feeney (Indiana) and Caleb Peterson (North Carolina) lead the guard class.

Don't put it past the Lions to continue to bolster their offensive line, despite using three of their top 5 picks on o-line last year. Detroit needs to improve their run game. Look what Dallas did a few years ago selecting offensive lineman in the first round in consecutive drafts. The strategy built them the most dominant offensive line in football.

MVP: For a rookie like Decker to come in and play every snap at left tackle, more than 1,000 total, that's a nice start to a career. Decker allowed just 4.5 sacks all season at one of the hardest positions in the league to play.

Decker looks to be a great first pick by Quinn.

Most improved: Corey Robinson went from seventh-round pick in 2015 to playing a role for the Lions in 2016.

He jumped veteran Cornelius Lucas on the depth chart to become Detroit's third/swing tackle. He played in 165 snaps total on offense. He started Detroit's Week 9 game in Minnesota and Week 17 against Green Bay in place of the injured Reiff, and probably would have started the playoff game had he not injured his foot against Green Bay.

How much the Lions think Robinson is ready to step into a bigger role could play a factor in Reiff's future.

Quotable: "Nothing has been decided on either one of those guys," Quinn said of Warford and Reiff's free-agent status. "We're working through our postseason evaluations as we go here.

"One thing that we do, we try not to make rash decisions on guys like that that are just coming into their free agent year. Our season just ended. I think those decisions are in the months and weeks to come."