In his NYT blog, Stanley Fish considers Larry Summers, and finds the ex-Harvard president wanting. 

It is not a question of intelligence and competence -– everyone agrees that Summers is very smart and very accomplished as an economist; it is a question of tact, patience, poise, self-restraint, deference, courtesy and other interpersonal virtues. Little that he did as president of Harvard suggests that Summers possesses these virtues….

It occurs to me that Summers, somehow, doesn’t feel consistent with the names we’re hearing floated for various Cabinet posts; he feels like part of a different era. That may make him just as incompatible with an Obama administration, with its emphasis on change, as anything about his temperament…..