Went to watch this last night. For Rihanna fans, don't waste your time, there's nothing to see, and her acting is about as good as her singing. Brooklyn Decker on the other hand is very tasty, just google her if you don't know who I'm on about!
Oh sorry, I forgot it's a film! It's watchable, wasn't what I was expecting storywise, but it kinda works, lots of special effects ala Transformers type CGI and sound effects. By no means a classic, storyline is a bit weak, but it all makes sense!