Re: World War Z ratings/spoilers
The unrated version was a bit more gory than the theater version but not quite as much as you'd think. The biggest thing I can think of you can see more of what happens when Gerry kills the zombie with a crowbar in the CDC hallway and has trouble removing it.
As noted above the TV series "The Walking Dead" still has more gore in it in the average episode than WWZ has in the unrated cut.
For me, and for many of us, the future is now in the past.