The Palmer report finding on the legality of the blockade was written in the main by two people with no background in international laws of war or of the sea. It's findings in regards to legality (which were the opinions of Palmer and were criticised by the Turkish other of the report panel, lawyers with actual expertise like Richard Falk, by a U.N. Human Rights Council independent panel, by the Goldstone report and by the UN Office for the Coordination of Humanitarian Affairs
So on the one hand you have the ex prime minister of New Zealand (who at least was a laywer albeit not one specialising in international laws) and the ex-president of Colombia (who had no legal background at all) saying in there opinion it was legal, and pretty much every other UN agency, human rights lawyer and international lawyer saying it wasn't. And as the Palmer report itself stated "the Panel cannot make definitive findings either of fact or law. But it can give its view."
http://www.reuters.com/article/2011/09/13/us-un-gaza-rights-idUSTRE78C59R20110913