Tannehill is doing some things good and some things bad. A statistic to monitor is his TD's, whether its led to a rush td or he finds the endzone in the air. Im sure it will improve as Tannehill learns more about NFL defenses. It doesn't aid him having anemic WRs.
Hartline is having a great year. While obviously the WR department could use another playmaker, I don't think it's nearly as bad as everyone thought it would be before the start of the year. So in your words if Tanny is still learning to read defenses, how do we know that he's always make the right passes/calls at the line and it's just "anemic WR's" faults?