To me it wasn't the play calling being passive, but rather they were put in a tough situation and didn't execute when they had the opportunity.
As some noted, they were in a tough spot on that drive. Be too aggressive and leave the potential to give the ball back to Houston with just under a minute left (and Houston having time outs remaining - I believe 3).
Here was the play by play:
1-10-NE 26 (1:09) (Shotgun) 34-S.Vereen left guard to NE 30 for 4 yards (94-A.Smith).
2-6-NE 30 40) (Shotgun) 12-T.Brady pass incomplete short right to 81-A.Hernandez.
3-6-NE 30 36) (Shotgun) 12-T.Brady pass incomplete short left to 81-A.Hernandez [98-C.Barwin].
4-6-NE 30 31) 14-Z.Mesko punts 32 yards to HOU 38, Center-48-D.Aiken, out of bounds.
I think running on first down was absolutely the right call because it got the clock moving, the run game was working pretty, and the Pats still had two timeouts. The only criticism I could see with this drive was on third down (to rush and force Houston to blow a TO instead), but that would be a bit of a stretch.