Pius XII was extolled by the Jewish community of his day. The revisionists have taken it upon themselves to say otherwise. The attack was written by ex-seminarians. The rebuttal was written by a RABBI. Therefore, I think it's enough to just quote Wikipedia. And yes, I actually read this book.
The Myth of Hitler's Pope: How Pope Pius XII Rescued Jews from the Nazis is a book written by American historian Rabbi David G. Dalin and published in 2005.
Rabbi Dalin first documents how popes through history have defended the Jews, and refuted attacks like the blood libel.
Then he gets to the main part of the book: defending the reputation of the late Pope Pius XII by presenting extensive documentation culled from Church and State archives throughout Europe. Rabbi Dalin suggests that Yad Vashem should honor Pope Pius XII as a "Righteous Gentile", and documents that Pius was praised by all the leading Jews of his day for his role in saving more Jews than Schindler. Pius's admirers included Chief Rabbi Isaac Herzog of Israel, Israeli Prime Ministers Golda Meir and Moshe Sharett, and Israel's first president Chaim Weizmann.
"anti-papal polemics of ex-seminarians like Garry Wills and John Cornwell (author of Hitler's Pope), of ex-priests like James Carroll, and or other lapsed or angry liberal Catholics exploit the tragedy of the Jewish people during the Holocaust to foster their own political agenda of forcing changes on the Catholic Church today."
UPDATE: CMR takes on the same subject.