Undeniably entertaining action-movie franchise fodder [but] had the producers [made] Mary Elizabeth Winstead the film's other action hero rather than going with the convention of casting yet another male, Die Hard 5 would have been awesome.
And having spent all these words ragging on the film, I will continue to semi-recommend it anyway. Why? Well, I happen to like big dumb action, and as long as that's all you're expecting, that is a thing that you shall receive.
There really is no point in looking for logic in a fifth Die Hard movie; these films have become a parody of themselves, wallowing in their inane action set pieces and sassy one-liners without much concern for plot or coherence.