For a second overall pick, many fans of the game and experts expected more out of offensive tackle Luke Joeckel. Since transitioning to left tackle in his rookie season he has struggled with injury, getting up to weight, and performing at an above average level.
2015 was almost a breakthrough year for Joeckel. He managed to not be a part of the problem and performed well in some games. His only clear-cut disaster was in Week 17 against the Houston Texans in which he was ruthlessly exploited.
Mediocrity is not what people expect from first round players and especially not from players that were drafted second overall.