There is no way in hell F&F6 is worse than STID. F&F6 knows exactly what it is, and while it may be a step down from 5, at no point does it forget what it's supposed to be doing or overstep its bounds as dumb fun cinema. STID not only retreads the exact same ground the first movie covered (Kirk's character arc is practically identical in both movies), but it has the gall to remake one of the best Star Trek stories ever told with a bunch of damn children who have in no way earned the bond that makes the story work in the first place. While STID is not a bad movie in and of itself, it is a pretty bad Star Trek movie, in that Star Trek should always have something to say, or at least a point of view, and STID has nothing. It's dumb fun, but it doesn't know it. F&F6 is acutely aware of it, and as a result is a vastly more successful piece of filmmaking than STID.