The biggest upgrade from Wily Mo to Kielty is the defense (capable of playing LF, CF, RF, 1B ), even then he does have more of a consistent bat than Wily Mo does. It wouldnt be a big acquisition that many are clamoring for but he would help the team
Here's his career stats, 579 games-- Twins, Blue Jays, Athletics
11 errors in 575 games, .987 fielding %