there is one thing commom between diehard 3 and diehard 4. both have a great storyline superb stunt , but the end was so pathetic as if the script writer has ran out of ideas or the director is in hurry to complete the movie.
Another flaw is the villain Timothy Olyphant could not justify his role. He is nowhere compared to Alan Rickman in Diehard or William Sadler in Die hard 2.