I'm not a huge sports fan so it helps that your immediate region has some pretty good teams to root for.
Detroit Red Wings, Detroit Pistons.
I don't like baseball one bit but I hear the Tigers haven't sucked in a few years! So add them too I suppose.
I will never like the Lions.
As for college I'm not a football fan at all but I still vaguely follow the Big 10 and I do hate it when MSU loses against Michigan for the umpteenth time (especially this past year when we were winning and then FUCKED IT UP with like a minute to go). MSU basketball is where it's at though.