Nothing is wrong. He's a kid in his third full season, and he's being brought along slowly. The good thing is that his defensive game is solid for a young player. He's slowly being given more opportunity; he started the season playing 12-14 minutes a game, and lately he's been getting 17-18, with some time on the second line and on the PK. The offensive progress is slow, but in a couple years he should be a solid contributor.
As far as his skill-set, he's incredibly slick with the puck, very, very strong on his feet for a guy his size, and he's patient and creative in the offensive zone. He's got a great attitude, too. He listened to the Jets' recommendation and developed in the AHL during the lockout, when he could have gone to the KHL and made more $. Give him time.