The Dolphins had an amazing comeback season last year but their division is quite strong this year and I personally think that they won't be beating New England this year.
Chad Penninton is doing good, but a they don't have that much real talent on the team. The Wildcat can help them but now that teams have seen it, they will have plays prepared to stop it.
Ronnie Brown looked great as well last season but his line isn't really that impressive. They got Vontae Davis in the first round, so that will help their "D" backs but still I don't think they will be going far this season.
I think the Dolphins will win 6-8 game. I also think they will be fighting with the Bills for third place in the AFC East.