To the GP's comments, Detroit has done a lot to come up in the world on its own, though I'm not sure I like the idea of Ford buying the old train station, nor am I entirely in love with the $2~3000/mo apartments in midtown and I kinda wish it still had more of its grunge pricing to go with the definite grunge feeling that still lingers...
To argue more specifically with the parent's point, the statistical area certainly counts Ann Arbor, and that count is no less reasonable than Oakland being counted with SF. Commute times from Ann Arbor <-> the rest of Metro Detroit are entirely reasonable compared to the rest of the major cities in the country. Whether you're willing to accept any commute longer than walking across the street is a personal decision, clearly a significant fraction of the population will accept it.