I personally didn't have that much problem with the playcalling last year, especially considering the circumstances.
As others have mentioned, the OL struggled for much of last year so in many cases their hands were tied as to the plays that could be called.
We also have to remember the fact that the defense really struggled for the first 2/3 of last year which forces a team to play catch-up and precludes the running game. This is indicated by the differences in the stats for the first twelve games as opposed to the stats for the last four.
In the first twelve games, the defense gave up an average of 21 points a game, in the last four 10.
In the first twelve games, the defense allowed an average of 353 yards of total offense a game, in the last four 226.
In the first twelve games, the defense allowed an average of 267 passing yards per game, in the last four 122.
We can argue all we want about the quality of the competition during the first 12 games as opposed to the last four, but the bottom line is the stats and W/L record during those periods speak for themselves.
This still isn't rocket science here. Play good defense, win the battle at the line of scrimmage, have a good run/pass ratio and you'll generally be successful.