Good start, but then it gets ruined

I gave this film a 9 out of 10, because it was exactly what I expected it to be.

I am only giving this movie a 1 for the great cast, though I can't imagine what any of them were thinking. This movie was horrible

A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."