Lack of good storyline.

It's not great by any means, but it's a pretty good movie that didn't leave me filled with regret for investing time in it.

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."

Great movie. Not sure what people expected but I found it highly entertaining.