Honestly, I found the premise, the plot, the characters, and the rather close to Higurashi style of character death, rather unappealing. However, the effects of the physical actions taken place (IE:
Where the mansion is starting to fall apart piece by piece, the fire causing it to deteriorate, and the rather realistic feeling of explosions
to be the focal point of why I enjoyed it.
I personally enjoy the darker series, but in this, despite it's faults, it still held some rather captivating ways of showing the actions, rather than the cliche action we get in most of anime.
As for the live action, honestly I expect it to be crap. It just doesn't have the plot, nor the essence that a live action requires to be more than decent. So I don't really have any hopes for it, probably watch it regardless though.