The central action Bruce Willis was involved in was great, but the police and FBI were all buffoons, with no verisimilitude in anyone's actions. Almost every emergency responder present literally just stood there the whole movie, as stage props, even when in mortal danger. Occasionally, the police leader would order something foolhardy, which would fail miserably in an instant. But, he never lost his cocky self-congratulatory assurance -- never called in anyone with any expertise -- and steadfastly refused to even talk to Bruce Willis' character, even to find out what was going on from the man in the center of the action. Unbelievably, Willis' character was in near continuous walkie-talkie communication with a low-ranking officer, but nobody cared. When two FBI agents showed up later, they immediately proposed a foolhardy plan that they *happily* stated would kill only 20-25% of the hostages.
Script and direction needed intensive reconstruction by expert emergency responders. The basic plot was good, and this could have been a great movie if the emergency responder part had been written and directed with any competence.
Die Hard came out in 1988, and I wanted to see it ever since -- but I never got around to it till 09/03/2016. I was in the mood for a good action flick, and really wanted to like this movie if it was at all possible. But, I could not bring myself to suspend disbelief at the poor script and direction.