It takes time. In 2 years I doubt that any of the current starters on the offensive line will still be starting. Maybe Carey or Hadnot if they continue to develop. Other than JT the same is probably true for the D-Line. (JT may even be gone due to cap) Who knows who our QB will be in a couple of years.
Saban has done a very good job so far...he has drafted pretty well with Ronnie, Daniels, Crowder, maybe Roth, plus some promising projects from the later rounds/supplemental draft. Im sure if we had like 20 picks in the draft Saban would have addressed all of the Dolphins needs, but since we didnt he did what he could and will have to add the remaining pieces in the next couple of years. In the meantime, he got some decent FA stopgap players so that we might at least be respectable.
Add to the mix the fact that the players are all learning new systems on both offense and defense. This is significant because when a new player joins a team he usually gets some help learning the system from his veteran teammates. This isnt possible when the systems and coaches change so the rookie or free agent player will take longer to get up to speed. As for the vets... you cant expect a couple of minicamps and a few weeks of training camp to be enough to learn a new system PLUS correct all the bad habits that were tolerated or even fostered under Wanny (and of course Tony Wise).
Give Saban a few more weeks and I think you will see an overall improvement in performance. Give him a couple of years and I think we will be serious contenders.....something that could never be described as "Wanny results"