Which preposition to use with mediocre

in Occurrences 4%

The feminine inspirations of his early youth had been numerous, but mediocre in quality.

as Occurrences 1%

Indifferent as an administrator, mediocre as a financier, passionate, haughty, headstrong, with many of the worst faults of an orator, he was still a man with idealsa patriot among placemen, pure where all were corrupt.

on Occurrences 1%

Many looked askance when Larry Gardner, supposedly a second baseman, was assigned to third, but the results more than justified the move, and it made room at second for Yerkes, a player who had proved only mediocre on the other side of the diamond.

through Occurrences 1%

He promoted assiduously the interests of the multitude and admired no one man, being excessively devoted to the common weal; suspicious of sovereignty, he hated everything that had grown above its fellows, but loved everything mediocre through pity for its weakness.

Which preposition to use with  mediocre