The movie is based off an article by John Carlin called "A Farewell to Arms". So basically someone read the article and said "you know what, this is cool but what if John McClain was somehow involved". Personally, I think that is awesome. Who hasn't sat around and randomly wondered what John McClain would do in a certain situation and thought it would be a good movie. The movie is pretty simple, a hacker tries to systematically shut down the entire United States computing systems. McClain, with help from his little hacker friend (Justin Long), spend two hours trying to stop it. What do we get for those two hours? John McClain kicking ass and taking names. Its basically: Intense action scene, followed by McClain ending it in some super cool way, followed by McClain making a smart ass comment that you can't help but laugh at. It makes for an entertaining two hours.
The plot is interesting but its nothing special. It is two straight hours of pure fun. So relax, don't worry that its the 4th installment of a series, don't worry that no matter how many times he can get hit McClain doesn't seem to die, don't worry about any of it! Just enjoy yourself, because the movie is pretty fun to watch.
P.S. The movie contains one of the coolest ways I've ever seen anyone die, but I won't spoil it for you.
Grade: B