This season they look horrible through 15 games.

They are 22nd in efficiency and 23rd in points allowed. They are winning games because they have stars and are coming through in the clutch, a completely different tale then years 1 and 2.

Should this be a concern for Miami moving forward?

I'd imagine a lot of it is Wade's decline in quickness and the fact that LeBron/Wade aren't getting in the passing lanes as often.