I was pleasantly surprised. Liked the added anime touches like the balistas combined with explosive tags serving as AA against diadara and the little present Sasori left behind for Kankuro and company really nice little touches that help extend things would while still being true to the story.

As for Diadara's lost arm. Keep in mind he's apart of the akatsuki, a collection of the most bat shit-crazy and badass missing nins within the naruto universe. I'm sure one of them is some sort of uber medic who can some how make him a new one.