At least with The Passion, there was a reason for the violence. IMO, the violence demonstrated just how much Jesus Christ endured for the sake of humanity. However, it was a very hard movie to watch and I had to turn away several times.
OTOH, blood and gore for its own sake... no thanks.
To be fair though, if Apocalypto is an accurate portrayal of the violence that went on back then, then it does not exist for it's own sake. It exists as a window to the past, to the history of how these people really were.
Now, you can choose to look through the window or walk right on by. Makes no difference which really. The fact remains however, that if it is an accurate portrayal, then it does not exist for it's own sake.