Surprised by the ending; liked it.
So many people here saying "They ate your friends! Wipe those cannibal MF'ers out!"
But look, every environmentalist in the world says that clear-cutting the rainforest is terrible, with long-term irreparable damage to ecological balance. Instead of giving the bulldozer companies a big green flag, she had a chance to cast an international spotlight on the issue and create a lot of interest from the public, which might ultimately make an impact on the bigshot government politicians who could actually effect change. She saw a rare opportunity and she made the most of it.
Justine reminded me of the survivor woman at the end of Hostel II. That woman took control of the situation, too. ("No, not my parents' money--MINE.") And then there was the bonus satisfaction of each woman exacting some personal revenge.
I'm not a big fan of gore movies, but I like what Eli Roth does with his heroines.