Here is the Dolphins summary from Evan Silva's roster rankings.
http://www.rotoworld.com/articles/nfl/47728/59/silvas-pre-camp-team-rankings?pg=3
Offensive Overview: I like the direction the Dolphins seem to be headed under new OC Bill Lazor, who spent 2013 with Chip Kelly in Philly and will bring to Miami a far more balanced offense designed to get speed back Miller into space, and scheme Wallace free releases into pass routes. There is still an unhealthy amount of question marks amongst this unit. Tannehill has every tool necessary to become a franchise quarterback, but his play particularly slipped down the stretch of last season, and absorbing 58 sacks as Tannehill did under Mike Sherman last year is cause for long-term concern. Miller is a talented runner, but has deficiencies in his overall game. The offensive line was sewn back together by rookie GM Dennis Hickey this offseason, following a disastrous 2013, only to lose C Mike Pouncey to June hip surgery. I see this offense as a major unknown entering camp, but I am optimistic about its future under Lazor. Lazor has a run-committed background -- something this team desperately needs -- and was Nick Foles' position coach during his breakout year. Tannehill has superior physical skills to Foles.
Defensive Overview: The Fins' 2013 defense underachieved under DC Kevin Coyle, but theoretically should be the strength of Hickey's roster. Wake, Starks, and Grimes are blue-chip starters. Mitchell and Delmas are probably short-term stopgaps, but they are quality role players who were signed to address needs. Jones, Ellerbe, and Wheeler are only one season removed from solid years, while Vernon is a huge breakout candidate after registering 11.5 sacks as a 22/23-year-old last season. He'll open the year at age 23. Even with Dion Jordan on suspension, Miami has depth in versatile DL Jared Odrick, rangy sophomore LB Jelani Jenkins, CB/S Jimmy Wilson, and 2013 second-round pick CB Jamar Taylor. Put simply, Coyle probably needs to go if this team doesn't play top-ten defense in 2014. It should be stout against both the run and pass.
http://www.rotoworld.com/articles/nfl/47728/59/silvas-pre-camp-team-rankings?pg=3