These movies just keep getting worse as they go on. Two obvious changes: Bruce Willis is what really makes the first one so much fun. As he goes on he looses that charm. Not sure if he is bored with Die Hard, bored with life, or just got too polished by the machine, but it is a noticeable decline. Also, a huge part of why the first one works is that it is all confined in the building and the local it crucial to the story. In the second we start expanding that out of the airport and now we have all of New York City to run around in. Also the racism talk comes off as forced and awkward.