Perhaps in your haste to condemn the film because of your need to see mangled bodies, you forgot that they showed Father Mychal Judge. While he was in the lobby and still alive, they showed a shot of him praying. After the 1st tower collapsed, they showed a filmed shot of the firefighters carrying him, but it showed only his boot. Cut into that sequence was the still picture of firefighters carrying his dead body to a nearby church. I'm sure you've seen it.
The symbolism of hearing the bodies crash to the ground and seeing the firefighters cringe was more than effective. Perhaps you need to see body parts and crushed skulls, but the families of the victims don't. Perhaps the film crew will recut the film for other audiences--particularly the Palestinians--who can dance and cheer when they see heads, arms, legs, lungs and spleen splattered all over the streets outsie of the WTC.