BB addressed this issue, as well. Not sure what you guys were seeing, but I looked at every one of Maroney's 81 carries for a story a write for Patriots.com several weeks ago, and it was plain as day that they were indeed blocking WORSE for him than, say, Faulk or Morris.
In Faulk's case, part of that - a huge part - is that he ran the ball WAY more against D's in passing situations and formations. As for Morris, it's possible they blocked better for him b/c they were more confident in his straight-ahead style, which is tangentially Maroney's "fault," I guess, but not really. In my view, he's run hard all year and the run blocking has been erratic all year.