Ok, saw this last night...
This was not a Die Hard movie. It wasn't even close. They felt the need to constantly mention McLane's name just so the audience would remember it is supposed to be a Die Hard movie.
The action was dull, unoriginal, by the numbers average action movie crap. The end was horrible with the jet and everything. The FX were crap, even on simple stuff it was noticeably bad.
The feel of the movie is completely different from the other Die Hards. McLane is too cheerful. He's just not the same when he doesn't get really irritated all the time and go off on people.
Really, this is just a dull, average action movie that if it didn't have Die Hard in the title, would barely be noticed by the general public. By FAR the worst in the series, and just completely disappointing. Unfortunately I don't think I'll be picking this one up when it comes out on Blu-Ray, not even to complete the set.