Not trying all of the restaurants
Yes, ALL of them. (This is not the patently unachievable task that it would be in Chicago or New York or San Francisco; bless your heart, Detroit.) Every year in Detroit the bar gets raised higher, making every decision to skip a new place a little worse. And sure, if the pace of new restaurants and foodstuffs and storefronts keeps up at the same rate for the next several years there will eventually come a time when it is impossible to hit all of the new places, but that’s a good thing.
Forgetting about the older restaurants
We all love things that are shiny and new, but the five-minute trend-seeking attention span isn't doing any favors for the long-established Detroit icons and institutions. They might not be hip, or trendy, or sexy, or buzzy, or serve locally sourced gastropub fare in a LEED-certified building designed with sustainably sourced reclaimed wood from deconstructed houses/barns, or have an amazing craft beer list, or a hot young namedrop-worthy chef, or even someone with the title of "chef," and it might be that the cash register is behind bulletproof glass, but these old places -- the ones for which the most recent recession was just another turn of the screw -- are an integral part of Detroit's history and cultural legacy, and many of them do actually serve good food.