He had a similar stretch in 2014 under Lazor. He's done it before, it's the inconsistency in his game.
When he's on he's top 10 no doubt. But he's not on enough to warrant the excitement.
Well actually, that was the season when PFF ranked the OL dead last (in '15 they "improved" to #31). So if anything, Tannehill should be lauded for that "stretch" in '14 and be given every benefit of the doubt in terms of what he could do/had done with even a mediocre-avg OL in '16. Sorry, when you factor in the guys who protect and give him time, it's just not apples to apples.