A. The defense does need better linebackers.
B. The D is getting a makeover, and is improving/getting healthy.
C. There were many good plays made by several Colts defenders throughout the game, and were praised by the announcers on several occasions.
D. The D is not even at "Full" health yet and we only just completed week 3 and are still in it division wise.
E. Not sure what game you watched, but in the one I watched the D kept us competitive.