Both the Israeli government and Hamas rejected the report as biased, which is a pretty good indication that it is even-handed.Juan Cole concludes that it is "even-handed." That's a "pretty good indication" that it's dreck.
Update: According to IRIB Radio, Haniyeh "welcomed" the report.
Further Update: Matthew Yglesias pronounces the Goldstone report "Not really unexpected, but good to have on record."
Further Update: Maan: "Haniyeh: World must back Goldstone's Gaza report"