Good Points
From what I have read, the climate scientists are reluctant to make Sandy the poster child for global warming. The reason is as you pointed out, there were several factors that made this hurricane nastier than it would have been normally. The other reason is that the factors that show evidence of global warming are seen in longer time periods than a single event.
Personally, I thought the calls to blame the storm on global warming to be as irrisponsible as saying that god is punishing the US for becoming gay friendly. Both statements happened and both reflect the lack of skeptical thinking.