re: I keep hearing "not built to be a running team". Well why?

Line's PFF scores on run/pass blocking:

Game 1 (Run/Pass block)
Armstead: 2.8/-0.1
Grubbs: 3.3/0.4
Goodwin: 2.3/-1.9
Evans: -0.2/0.4
Strief: -1.2/2.4
Cumulative: 7.0/1.2

Game 2 (Run/Pass Block)
Armstead: 0.8/0.6
Grubbs: -0.7/-0.8
Goodwin: 1.3/0.5
Evans: 2.3/0.7
Strief: 3.3/1.6
Cumulative: 7.0/2.6

Game 3 (Run/Pass Block)
Armstead: -0.1/-0.2
Grubbs: -1.1/1.5
Goodwin: 0.1/-0.5
Lelito: 0.9/0.4
Evans: 0.4/-2.0
Strief: -1.1/2.3
Cumulative: -0.9/1.5

Game 4 (Run/Pass Block)
Armstead: -0.5/0.4
Harris: -2.9/-0.4
Grubbs: -0.8/-0.1
Goodwin: 0.4/-2.9
Evans: 0.7/-0.6
Strief: -0.8/-0.1
Cumulative: -3.9/-3.7

Game 5 (Run/Pass Block)
Armstead: 1.4/1.7
Grubbs: 2.8/-1.0
Goodwin: 0.8/-2.0
Lelito: 0.1/-2.5
Evans: 0.3/-6.5
Strief: -2.0/0.1
Cumulative: 3.4/-10.2

For the year:
Run Blocking 12.6 (+14 in the first 2 weeks)
Pass Blocking -8.6 (-13.9 in the last 2 weeks)

Atlanta: 28th ranked Run Defense
Cleveland: 29th ranked Run Defense
Minnesota: 19th ranked Run Defense
Dallas: 20th ranked Run Defense
Tampa Bay: 18th ranked Run Defense

Atlanta: 4 sacks on the year
Cleveland: 8 sacks on the year
Minnesota: 10 sacks on the year
Dallas: 5 sacks on the year
Tampa Bay: 9 sacks on the year