I've got no issues with how MM refused to run against a stacked front. A stacked front vs Aaron Rodgers is the kind of thing we've dreamed of ever since we got Lacy. But the fact that we still couldn't get much going, especially with Cobb in what would appear to be a great matchup for him shows the merit of a 1-gap defense perfectly IMO.
I think Cobb is way too slow to pull of the Harvin sweep type plays. I'd like to see Cobb outrun a linebacker before I ask him to outrun an entire defense.