You clearly didn't watch the game if you thought this. Mac was forced to get the ball out lightning quick throughout the entire game and was still getting lit up. 49ers fans were (and still are) melting down about the state of their o-line.
A lot of people are implying that he managed this game as a system qb, but this was a classic "carry" game. Nearly all the SF weapons are out and his o-line stunk, but he found a way to get it done. I'm not implying that he can carry teams regularly like the top QB's can, but this performance was the complete opposite of what detractors make him out to be - gutsy, clutch, and driven.