The O line needs to get stronger and coordinated to give the pass plays time to function. Better WRs would help some, too. The pass pro breaks down too easily and Aaron is running away w/o a chance of getting off good throws way too often.
But having said all that, it is the D that needs a major upgrade. The pass defense is wobbly. The run defense is ineffective most of the game and the pass rush just is not good enough. The scheme is not effective as played this year. BUT another top pass rusher (DE or OLB) would be a choice 1st round pick since we won't be picking last/near last like the past x years.