he played in what, 45 games during his career here...and you managed to list 11. Yup, that's about right...
The distinguishing characteristic given was 'big games', not all games. Not exactly a scientific metric for determining what is or isn't big, but I looked mostly at games in hostile environments, primetime national matchups and against ranked teams.
Please, if you go back and actually look at the box scores Martinez did jack in a lot of those games. If I recall, 2010 missouri was Helu's 300 yard rushing performance and a lot of these games you mention coincide with a huge performance from one of our backs or timely play by our defense. People seem to be real quick to forget games where he single handily threw us out of games by throwing horrible picks without a nebraska receiver within 5-10 yards of the ball.
I'm going to echo Knapp and say, yes, please, come back at me with statistics to prove your point.
But even if you do, you're having it both ways. You can't simultaneously discredit him for single-handedly losing us games while also discrediting him for not single-handedly winning us games.
Actually you know nevermind, I'll do the statistics myself thanks:
2010 Washington (First ever game against BCS competition in the loudest stadium in the country)
150 yards passing, 1 TD, 0 picks - 137 yards rushing, 3 TD
2010 Kansas State (Thursday night conference opener on national primetime television)
128 yards passing, 1 TD, 0 picks - 241 yards rushing, 4 TD
2010 Oklahoma State (Away game against #14 ranked team)
323 yards passing, 5 TD, 0 INT - 112 yards rushing
2010 Missouri (Against #6 ranked team)
115 yards passing, 1 TD, 0 INT - 16 yards rushing (was injured in the 3rd quarter)
2011 Ohio State (Primetime national game against a bad OSU team that still had elite talent)
191 yards passing, 2 TD, 1 INT - 102 yards rushing, 1 TD
2011 Michigan State (Against #9 ranked team)
80 yards passing, 1 TD, 1 INT - 23 yards rushing
2011 Penn State (Away game against #12 ranked team)
143 yarsd passing, 0 TD, 0 INT - 56 yards rushing
2012 Wisconsin (Primetime national game)
181 yards passing, 2 TD, 0 INT - 107 yards rushing, 1 TD
2012 Northwestern (Away game against the team that finished the season #16)
342 yards passing, 3 TD, 0 INT - 65 yards rushing, 1 TD
2012 Michigan (Against #20 ranked team)
166 yards passing, 1 TD, 1 INT - 58 yards rushing
2012 Michigan State (Away game, quasi night/primetime game. Debatable on 'big game' metrics I suppose)
160 yards passing, 2 TD, 3 INT - 205 yards rushing, 2 TD