It’s no surprise that the weakest link of the Minnesota Vikings is the offensive line. The Vikings have the best running back in the NFL to go along with a young, Pro Bowl quarterback, yet the offense as a whole was only ranked 29th in the league for yards per game (321.2 ypg), 31st for passing yards per game (183 ypg) and 4th for rushing yards per game (138.2 ypg). The Vikings were also 25th in the league for sacks given up with 45.
Pro Football Focus has a wonderful article, breaking down and ranking the offensive lines in the NFL for 2015.