Die Hard is fantastic. As much about corporate America and outright fucking annoying and inadequate red-tape procedure as it is about kicking foreign terrorist ass.
Die Hard 2 is still head and shoulders above most other action films being made at the time, but it's basically a retread of the first film's narrative template... which works only because Bruce Willis is great.
Die Hard with a Vengeance is very good, in general, but too much in the vain of the Lethal Weapon formula, bringing in bad ol' Samuel L. for some white-black racial tension... very formulaic, but very good at being formulaic; and Jeremy Irons is pretty good.
Die Hard 4.0 looks shit.
...dot com bold typeface rhetoric. You go clickety click and get your head split. 'The hell you look like on a message board Discussing whether or not the Brother is hardcore?
