This is not a secret ISIS plan. There really are Star Wars spoilers below the jump.
(Of course, that's just what ISIS would say, isn't it?)
I'm sure that its flaws will be more obvious on repeated viewings, but at first glance Rogue One is the best film since Empire. It manages to achieve this in spite of sharing a glaring flaw with the last movie, to whit, a main character who is almost completely without personality or interest. Indeed, except that one is a proto-Jedi and the other apparently not, they seem to be exactly the same character. Both young women orphaned by the conflict; both have extraordinary fighting abilities (this last one without even an appeal to latent ability with the Force as an excuse); both claim to want nothing more than to be left alone, but secretly long for reunion with their fathers. The fate of the universe hangs on each, and both are recognized by all as the moral pillars of the story, somehow, in spite of their lack of accomplishments or contributions to the war before they showed up five minutes ago. Both are sufficiently empty of personality to allow, I suppose, the widest possible range of viewers to see themselves in the character as a kind of wish-fulfillment.
That major flaw aside, it's really quite a good movie. The best thing about it is its willingness to do something that hasn't been done since the very first Star Wars, when Han shot Greedo without warning or apology. It accepts that a resistance movement depends on spies, on assassins, and on a high degree of sacrifice. There is only one magic sword in this movie, and the black knight has exclusive access to it.
The moral maturity shown by most of the characters in the film gives Rogue One more depth than in most of the others in the series. There is something much more interesting going on here than Good Guys versus Bad Guys. It's definitely worth two hours if you're a fan of Star Wars. If you aren't, of course, you won't like it. It is very much a Star Wars movie.