Here's my opinion...........
Detroit "can" pull it off and beat Miami, and then win the NBA Championship if they face San Antonio or Dallas, as they match up well with them....
Oddly though, I do not think they could defeat Phoenix if the Suns somehow get through....... (which I do not expect them to)
Despite Detroit's D, I just don't see them scoring enough points to beat Phoenix in a 7 game series. Even with the Pistons solid defense Phoenix can still put up around 100 points per game. That's something Detroit doesn't normally have to deal with in the East.........