My friends have had fierce discussions about this in the past. Their opinions all differ from mine (and mostly each other), but I'd be interested to see if there's anyone out there who actually agrees with my assessment.
1) Die Hard
2) Die Hard 4
3) Die Hard 3
4) Die Hard 2
5) Die Hard 5
1) Die Hard
2) Die Hard 4
3) Die Hard 3
4) Die Hard 2
5) Die Hard 5