This is the norm.
Anyone predicting Super Bowl for the Dolphins never took the time to analyze this team. They were terrible last year, and adding a mediocre QB in an offense that lacks a running back and receivers who can catch with any consistency breeds failure.
When Ronnie Brown can become a more decisive runner, when Chris Chambers can catch more than half the balls thrown to him, and when Culpepper doesn't force-feed the ball to his primary read when the game is on the line... only then will you see a changed squad.
They are very likely to go about 5-11. Last season Ricky was there to save them, but the same cannot be said for this year.
Do not expect change this year. The Dolphins will be trash for the next 2-3 years while Saban guts and rebuilds the defense and guts and rebuilds the offense.
You can't blame him for bringing in Culpepper and Brown and Jason Allen, all of whom he thought were quality players. Saban is a great football coach, but he is not the greatest talent evaluator, and the sooner he realizes this, the better off this team will be.
Unfortunately for Culpepper, Brown, Chambers, etc owners, there really isn't much you can do except put them on your bench. They are all sell-low targets right now, and no one wants to put an ailing skill player on their team.