They gave us a B which is pretty fair IMO.
http://espn.go.com/nfl/insider/story/_/id/12913383/offseason-grades-all-32-teams-nfl
The best offseason work assures nothing in the NFL, as Tampa Bay and a few other teams proved again last offseason. But we can still evaluate the jobs teams have done in addressing their roster needs through free agency, trades and the draft, with an eye toward how moves affect outlooks in the short and long terms.
To that end, I've enlisted ESPN analysts Bill Polian, Louis Riddick, Matt Williamson and Field Yates, quoting each extensively in our 2015 NFL offseason grades. I also took into account Mel Kiper's draft grades for every team.
Miami Dolphins: B
Re-signed: QB Ryan Tannehill, OL Jason Fox, OL Mike Pouncey, P Brandon Fields, QB Matt Moore, S Louis Delmas
Veteran additions: CB Brice McCain, WR Greg Jennings, C J.D. Walton, OG Jacques McClendon, OT Jeffrey Linkenbach, TE Jordan Cameron, DT Ndamukong Suh, OLB Spencer Paysinger, CB Zack Bowman, WR Kenny Stills, QB Josh Freeman
Veteran subtractions: WR Brandon Gibson, WR Brian Hartline, TE Charles Clay, CB Cortland Finnegan, RB Daniel Thomas, OG Daryn Colledge, CB James Wilson, DT Jared Odrick, OLB Jason Trusnik, SS Jimmy Wilson, OLB Jonathan Freeny, RB Knowshon Moreno, OG Nate Garner, LB Philip Wheeler, CB R.J. Stanford, DT Randy Starks, C Samson Satele, G Shelley Smith, WR Mike Wallace, LB Dannell Ellerbe, CB T.J. Heath, CB Lowell Rose
Draft picks: 1-DeVante Parker (WR), 2-Jordan Phillips (DT), 4-Jamil Douglas (G), 5a-Bobby McCain (DB), 5b-Jay Ajayi (RB), 5c-Cedric Thompson (DB), 5d-Tony Lippett (WR)
Analysis: Williamson was highest on the Dolphins' offseason, giving them an A-minus for adding Suh and making moves to strengthen a promising offense. They were a solid B even before reaching agreement with Tannehill on a deal that seemed to work well for both parties.
"It feels weird not going higher than a B-plus after landing Suh and extending Tannehill and Pouncey," Yates said of his Dolphins grade. "You land the pre-eminent free agent available at a huge price. Those deals have not proven to be foolproof in the past. I have a little reservation about roster construction. They have a lot of cooks in the kitchen in the front office after adding Mike Tannenbaum and I'm not sure that is a great thing. Wallace, Clay and Hartline are out. Do they have a better cast of weapons now? Let's not mistake activity for achievement, to quote John Wooden."
Riddick questioned whether Suh could ever live up to his contract. He loved Parker's selection in the first round and thinks Jarvis Landry is one of the NFL's better young receivers, but he wasn't sure about Stills' career trajectory or how much Jennings has left.
"The best way to attack New England is up the middle and Suh gives them that ability," Polian said. "They really need to run the ball effectively. If they do that and protect Tannehill better, then throw it in fourth gear and let's go."
http://espn.go.com/nfl/insider/story/_/id/12913383/offseason-grades-all-32-teams-nfl