The main problem with the plot.....(possible spoiler )
Why is it that civilisations who are so smart to create such a powerful object such as the Triangle of Light, then realise that it is dangerous, split the thing up? I mean shouldn't they have destroyed it then and there, and then the problem would be solved? But of course, then there wouldn't be a movie!
In the film, she destroyed it quickly with a bullet from a gun. I understand her motivations were to see her father again, but if she wants to save the world, she shouldn't have revealed to the bad guys in Cambodia about the true eye, then they could have waited another 10,000 years or so. Or if not that, get the first triangle, then destroy it. The end.
If it weren't for that logic, the movie could have been a lot better.