That being said, apparently this was based on a book... albeit not a very well known one, and certainly not as popular as The Fault in Our Stars. But still, it is not completely original as I had earlier believed.
Anyway, back to the movie... Tom Cruise brings it like he always does. You can pretty much expect him to rock a performance like this no matter how bad the movie. But then there's Emily Blunt who just shouldn't exist on this world. But I'm so glad she does because she's awesome and very fun to watch... granted that scar was super weird. Bill Paxton got in on the fun here and really gave a great performance as well.
What probably worked the best about this film is, Doug Liman knew when to take the material seriously and when to just have fun with it. I was incredibly surprised at how many laugh out loud moments there were in what I assumed from the ads would be a very serious/gritty sci-fi thriller. Well I'd go so far as to say it's at least an eighth comedy... but that's a genre conversation and probably too convoluted for an entry here.